| Lease income — operating leases | $496.2M | $502.9M | $521.1M | $531.3M | $520.9M | $531.1M | $538.1M | $552.8M |
| Operating Income Loss Including Unconsolidated Real Estate Joint Ventures | $387.9M | $394.1M | — | $418.6M | $408.6M | $415.1M | — | $431.6M |
| Fixed Lease Income | $396.6M | $405.5M | — | $416.2M | $413.7M | $418.9M | — | $425.3M |
| Cash Provided by (Used in) Operating Activity, Including Discontinued Operation | $294.1M | $295.9M | $239.5M | $223.8M | $305.4M | $332.4M | $258.4M | $243M |
| Cash Provided by (Used in) Financing Activity, Including Discontinued Operation | -$91.3M | — | -$113.2M | -$650.5M | -$107.5M | -$141.6M | -$320.6M | -$237.7M |
| Cash Dividends on Common Stock | $169.7M | $169.7M | $178.1M | $177.5M | $176.8M | $176.8M | $183.4M | $182.9M |
| Dividends, Common Stock | $161.8M | $161.8M | — | $169.9M | $169.3M | $169.3M | — | $175.3M |
| Comprehensive Income Including Noncontrolling Interest | $123M | $113.7M | — | $122.6M | $158.1M | $139M | — | $173M |
| Comprehensive Income Attributable to Parent | $123M | $113.7M | — | $122.6M | $158.1M | $139M | — | $173M |
| Comprehensive Income Including Noncontrolling Interest | $123M | $113.7M | — | $122.6M | $158.1M | $139M | — | $173M |
| Comprehensive income (loss), including noncontrolling interest | $123M | $113.7M | — | $122.6M | $158.1M | $139M | — | $173M |
| Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | $123M | $113.7M | — | $122.6M | $158.1M | $139M | — | $173M |
| Comprehensive Income (Loss), Total | $123M | $113.7M | — | $122.6M | $158.1M | $139M | — | $173M |
| Comprehensive Income, Including Noncontrolling Interest | $123M | $113.7M | — | $122.6M | $158.1M | $139M | — | $173M |
| Comprehensive Income Including Noncontrolling Interest | $123M | $113.7M | — | $122.6M | $158.1M | $139M | — | $173M |
| Total Comprehensive Income | $123M | $113.7M | — | $122.6M | $158.1M | $139M | — | $173M |
| Comprehensive Income | $123M | $113.7M | — | $122.6M | $158.1M | $139M | — | $173M |
| Comprehensive Income (Loss), Net of Tax, Attributable to Parent | $120.7M | $111.3M | — | $120.9M | $156.1M | $136.7M | — | $171.5M |
| Other Comprehensive Income (Loss) | $120.7M | $111.3M | — | $120.9M | $156.1M | $136.7M | — | $171.5M |
| Net loss | $122.1M | $138.4M | — | $134.5M | $164.9M | $140.1M | — | $166.3M |
| Reclassifications Net of Tax | $111.8M | $128M | $154.8M | $125.1M | $155.4M | $130.2M | $143.6M | $157.4M |
| Net Income Loss Available To The Companys Common Shareholders | $111.1M | $125.6M | — | $124.5M | $154.8M | $129.6M | — | $156.7M |
| Interest Paid, Net | $77.4M | $69.8M | $80.5M | $84M | $83.4M | $75.9M | $75.7M | $90.6M |
| Interest Paid, Excluding Capitalized Interest, Operating Activity | $77.4M | $69.8M | $80.5M | $84M | $83.4M | $75.9M | $75.7M | $90.6M |
| Advances on loans receivable | — | $11.2M | — | $0 | $46.2M | $205.8M | — | $76.4M |
| Mortgage And Other Financing Loans | — | $12.1M | — | — | — | $205.8M | — | $76.4M |
| Property taxes | $66.2M | $65M | $67.2M | $69.9M | $66.6M | $67.4M | $73.6M | $72.8M |
| Operating Income Loss From Unconsolidated Real Estate Joint Ventures | $49.8M | $49.2M | — | $51M | $49.6M | $48M | — | $51.1M |
| Increase Decrease In Capital Expenditures Incurred But Not Yet Paid | — | $3.9M | — | $48.4M | — | $660K | — | $48.9M |
| Cash Provided by (Used in) Investing Activity, Including Discontinued Operation | -$212M | -$81.3M | -$226.7M | -$130.6M | -$102.6M | -$258.2M | — | -$48.5M |
| Expected sale proceeds | — | $88K | — | $1.3M | $795K | $56.1M | — | $44M |
| Net Change in Cash and Restricted Cash | — | $662.5M | — | -$557.2M | — | -$67.3M | — | -$43.2M |
| Proceeds From Loans | — | $25M | — | $23.1M | $27M | $21.7M | — | $39.9M |
| Payments For Repurchase Of Redeemable Noncontrolling Interest | — | — | $37M | $1M | — | — | $30.2M | $39.1M |
| Distributions of earnings from equity method investees | $29.2M | $22.2M | $22.8M | $22.1M | $22.5M | $27.1M | $24.7M | $30M |
| Decrease In Other Assets | — | — | — | — | — | — | — | $26.2M |
| Change in Accounts Payable and Accrued Liabilities | — | $48.7M | — | -$34M | — | $57.3M | — | -$25.1M |
| Accounts payable and other current liabilities | $5.1M | $48.7M | -$80M | -$34M | — | $57.3M | -$36.9M | -$25.1M |
| Income Loss From Investments In Joint Ventures | $21.5M | $21M | $20.4M | $22.7M | $24M | $27M | $23.1M | $24.8M |
| Aggregate Purchase Price | — | — | — | — | — | — | — | $24.2M |
| Decrease In Other Liabilities | — | — | — | — | — | — | — | $24.2M |
| Finance Lease Purchase Price | — | — | — | — | — | — | — | $24.2M |
| Increase (Decrease) in Other Operating Assets | — | $19.1M | — | $28.7M | — | $8.4M | — | $21.6M |
| Proceeds From Mortgage Loan Financings | — | — | — | $0 | — | — | — | $17.4M |
| Change in Other Liabilities | -$4.6M | -$4.6M | -$4.6M | -$7.8M | — | — | — | -$16.6M |
| Other liabilities | -$4.6M | -$4.6M | -$4.6M | -$7.8M | — | — | — | -$16.6M |
| Proceeds From Repayments Of Other Debt | — | — | — | -$48.8M | — | — | — | -$16.1M |
| Total Net Gain Loss On Sale Of Operating Properties | $75K | $551K | $330K | $887K | $38.9M | $3.7M | $19.1M | $15.7M |
| Mortgage Receivable | — | — | — | — | — | — | — | $15M |
| Amortization of above and below Market Leases | — | -$7.2M | — | -$5.3M | -$7.3M | -$9.7M | — | -$13.6M |
| Amortization Of Above And Below Market Leases Income | $4.4M | $7.2M | — | $5.3M | $7.3M | $9.7M | — | $13.6M |
| Compensation and employee benefits | $8.3M | $8.1M | — | $6.7M | $11.6M | $6.9M | — | $12.7M |
| Stock-based compensation | $8.2M | $8.1M | $8.5M | $6.7M | $11.6M | $6.9M | $7.9M | $12.7M |
| Pre-tax stock-based compensation cost | — | $8.1M | — | $6.7M | $11.6M | $7M | — | $12.7M |
| Interest and Fee Income, Loans and Leases | — | $11.9M | — | $11.3M | $12M | $12.4M | — | $12.5M |
| Mortgage And Other Financing Income Net | $4.8M | $11.9M | $10.3M | $11.3M | $12.1M | $12.4M | $15.3M | $12.5M |
| Proceeds From Distributions Received From Real Estate Partnerships | — | $4M | — | $9.3M | $4.9M | $4.3M | — | $8.2M |
| Dividends on preferred shares | $8M | $8M | — | $7.6M | $7.5M | $7.5M | — | $7.5M |
| Straight line rent receivables | — | -$4.3M | — | -$6.3M | -$4.3M | -$8.4M | — | -$6.6M |
| Other comprehensive income (loss), after-tax | $957K | -$24.7M | — | -$11.9M | -$6.9M | -$1.1M | — | $6.6M |
| Other comprehensive income (loss) | $957K | -$24.7M | — | -$11.9M | -$6.9M | -$1.1M | — | $6.6M |
| Payment Of Financing And Stock Issuance Costs | $25K | $5.5M | $1.8M | $22K | $6.6M | $832K | $550K | $6.3M |
| Tax Withholding for Share-Based Payments | $34K | $595K | $589K | $11.5M | $108K | $28K | $423K | $6M |
| Payment, Tax Withholding, Share-Based Payment Arrangement | $34K | $595K | $589K | $11.5M | $108K | $28K | $423K | $6M |
| Stock Issued During Period Value Restricted Stock Award Forfeitures | $35K | $599K | — | $11.5M | $110K | $41K | — | $6M |
| Surrender Of Common Stock | — | $598K | — | $11.5M | $110K | $41K | — | $6M |
| Income Loss From Other Investments | $7.7M | $216K | $353K | $701K | $1.7M | -$811K | $1.8M | $5.8M |
| Increase (Decrease) in Accounts and Other Receivables | -$1.5M | -$1.5M | -$1.5M | -$7.4M | — | — | — | -$5.5M |
| OCI - Cash flow hedge, net of tax | $1.4M | -$22.1M | — | -$10.3M | -$5.4M | -$540K | — | $5.4M |
| OCI Cash Flow Hedge Gain (Loss) | $1.4M | -$22.1M | — | -$10.3M | -$5.4M | -$540K | — | $5.4M |
| Unrealized Gains (Losses) on Hedge Instruments | $1.4M | -$22.1M | — | -$10.3M | -$5.4M | -$540K | — | $5.4M |
| OCI - Cash Flow Hedges, Net of Tax | $1.4M | -$22.1M | — | -$10.3M | -$5.4M | -$540K | — | $5.4M |
| Unrealized gains (losses) on hedge instruments | $1.4M | -$22.1M | — | -$10.3M | -$5.4M | -$540K | — | $5.4M |
| Unrealized Gain Loss On Interest Rate Cash Flow Hedges Pretax Accumulated Other Comprehensive Income Loss | $3.4M | -$19M | — | -$9M | -$4.1M | $762K | — | $5.3M |
| Management Fee And Other Fee Income | $4M | $4.8M | $4.3M | $5.3M | $4.2M | $4.7M | $4.4M | $5.2M |
| Operating Expenses Rent | $4.2M | $4.2M | $4.1M | $4.2M | $4.2M | $4.2M | $4.2M | $4.1M |
| Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture | — | — | — | — | $6.4M | — | — | $4.1M |
| Noncontrolling Interest, Change in Redemption Value | — | $4.1M | — | $577K | -$1.1M | — | — | -$3.7M |
| Noncontrolling Interest Decrease From Redemptions Or Conversions Of Interests | $3K | $3.3M | — | — | — | — | — | -$3.6M |
| Operating Lease Provision For Credit Loss | $4.9M | $6.5M | — | $3.2M | $6M | $2.2M | — | $3.1M |
| Repayments Of Other Long Term Debt | $2.2M | $2.2M | $3.1M | $3.5M | $2.7M | $2.9M | $3.1M | $3.1M |
| Income Taxes Paid, Net | $6.6M | $3.3M | $0 | $23.4M | $2.4M | $33K | $0 | -$2.1M |
| Income Taxes Paid, Net | $6.6M | $3.3M | $0 | $23.4M | $2.4M | $33K | $0 | -$2.1M |
| Amortization Of Financing Costs And Discounts | -$200K | -$45K | — | $100K | $567K | $1.7M | $1.9M | $1.6M |
| Other income, net (Note 6) | $910K | $10.3M | $7.3M | $207K | $2.9M | -$2.4M | $1.3M | -$1.6M |
| Payments to Noncontrolling Interests | — | — | — | $2M | — | — | — | $1.6M |
| OCI Attributable to Noncontrolling Interest | $2.3M | $2.4M | — | $1.7M | $2M | $2.3M | — | $1.4M |
| Less: comprehensive income attributable to noncontrolling interest | $2.3M | $2.4M | — | $1.7M | $2M | $2.3M | — | $1.4M |
| Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest | $2.3M | $2.4M | — | $1.7M | $2M | $2.3M | — | $1.4M |
| Comprehensive Income Attributable to Noncontrolling Interests | $2.3M | $2.4M | — | $1.7M | $2M | $2.3M | — | $1.4M |
| Comprehensive Income, Noncontrolling Interest | $2.3M | $2.4M | — | $1.7M | $2M | $2.3M | — | $1.4M |
| Lease Liabilities Arising From Obtaining Operating Right Of Use Assets Non Acquisition | — | $1.4M | — | $0 | $7.4M | — | — | $1.4M |
| Minority Interest Decrease From Distributions To Noncontrolling Interest Holders | $1.6M | $1.2M | — | $1.2M | $1.6M | $1.4M | — | $1.2M |
| Oci Equity Method Investment After Tax | -$404K | -$2.7M | — | -$1.7M | -$1.4M | -$514K | — | $1.2M |
| Payments to Acquire Marketable Securities | — | $1.4M | — | $1K | $1M | $312K | — | $1M |
| Payments to Acquire Marketable Securities | — | $1.4M | — | $1K | $1M | $312K | — | $1M |
| Add: dilutive effect of potential common shares (in shares) | $129K | $289K | — | $178K | $369K | $732K | — | $847K |
| Proceeds from maturities of marketable securities | — | $700K | — | $500K | — | — | — | $679K |
| Participating Securities Distributed And Undistributed Earnings Loss Diluted | $700K | $687K | — | $604K | $622K | $640K | — | $619K |
| Escrow Deposits Related To Property Sales | — | $0 | — | $0 | $48.7M | — | — | $561K |
| Recoveries | — | $0 | — | $0 | $693K | $397K | — | $518K |
| Total provisions for credit losses | — | — | — | $0 | $693K | $2.3M | — | $518K |
| Payments for Repurchase of Common Stock | — | $0 | $0 | $0 | $58.8M | $0 | $61.5M | $462K |
| Stock Repurchased During Period, Value | — | $5K | — | $0 | $58.8M | — | — | $462K |
| Net Income Loss Attributable To Redeemable Noncontrolling Interest | $1.1M | $1.1M | — | $813K | $656K | $780K | — | $359K |
| Redeemable Noncontrolling Interest Decrease From Distribution | — | $1.1M | — | $813K | $658K | $778K | — | $359K |
| Redeemable Noncontrolling Interest Increase From Income | — | $1.1M | — | $813K | $656K | $780K | — | $359K |
| Payments To Acquire Interest In Joint Venture | — | $376K | — | $1.8M | $1.1M | $1.1M | — | $299K |
| Adjustment Of Redeemable Noncontrolling Interests To Estimated Fair Value | — | $3.7M | — | -$577K | -$56K | $215K | — | $286K |
| Temporary Equity Accretion To Redemption Value Adjustments | — | — | — | -$577K | — | — | — | $286K |
| Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net | $2.1M | $3.1M | — | $1.3M | $1.3M | $1.3M | — | $102K |
| Contributions from Noncontrolling Interests | — | $274K | — | $0 | — | — | — | $78K |
| Proceeds from Noncontrolling Interests | — | $274K | — | $0 | — | — | $18K | $78K |
| Derivative Gain Loss On Derivative Net And Marketable Securities Gain Loss Excluding Other Than Temporary Impairments | — | — | — | -$325K | — | — | — | -$29K |
| Number Of Swap Agreements | — | — | — | — | — | — | — | 20.00 |
| Number Of Properties Associated With Finance Leasing Arrangement | — | — | — | — | — | — | — | 2.00 |
| Number of reportable segments | — | — | — | — | — | — | — | 1.00 |
| Number of reportable segments | — | — | — | — | — | — | — | $1 |
| Common Stock Dividends Per Share Declared | $0.2 | $0.2 | — | $0.3 | $0.3 | $0.3 | — | $0.3 |
| Common Stock Dividends Per Share | $0.2 | $0.2 | — | $0.3 | $0.3 | $0.3 | — | $0.3 |
| Dividends per share declared | $0.2 | $0.2 | — | $0.3 | $0.3 | $0.3 | — | $0.3 |
| Dividends per share declared | $0.2 | $0.2 | — | $0.3 | $0.3 | $0.3 | — | $0.3 |
| Common Stock Dividends Per Share Declared | $0.2 | $0.2 | — | $0.3 | $0.3 | $0.3 | — | $0.3 |
| Dividends declared (in dollars per share) | $0.2 | $0.2 | — | $0.3 | $0.3 | $0.3 | — | $0.3 |
| Common Stock Dividends Per Share Declared | $0.2 | $0.2 | — | $0.3 | $0.3 | $0.3 | — | $0.3 |
| Common Stock Dividends Per Share Declared | $0.2 | $0.2 | — | $0.3 | $0.3 | $0.3 | — | $0.3 |
| Capital Expenditures | — | — | — | $18.4M | — | — | — | — |
| Finance Lease Principal Paid | — | $0 | — | $24.4M | — | — | — | $0 |
| Asset Acquisition Consideration Transferred | — | $172M | — | $134.6M | — | $77.2M | — | — |
| Asset Acquisition Consideration Transferred Debt | — | — | — | $0 | $0 | $31.9M | — | — |
| Asset Purchase Other Consideration | — | $1.7M | — | $2M | — | $7.1M | — | — |
| Discontinued Operation Tax Effect Of Income Loss From Disposal Of Discontinued Operation | — | — | — | $200K | $200K | — | — | — |
| Finance Lease Principal Payments | $0 | $0 | $265K | $24.4M | — | — | — | $0 |
| Payments for Repurchase of Preferred Stock and Preference Stock | $0 | $5K | $26.7M | $2.8M | $663K | — | — | $0 |
| Payments to Acquire Property, Plant, and Equipment | — | — | — | $18.4M | — | — | — | — |
| Proceeds from long-term lines of credit | — | -$220M | — | $120M | -$120M | $40M | — | $0 |
