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Consolidated Statements of Equity - USD ($) | General Partners' Capital Account [Member] | Common Stock | Additional Paid-in Capital | Limited Partner [Member] | Limited Partner [Member] Limited Partners' Capital Account [Member] | Limited Partner [Member] General Partners' Capital Account [Member] | Limited Partner [Member] Total Partnership Capital [Member] | Limited Partner [Member] AOCI Attributable to Noncontrolling Interest [Member] | Limited Partner [Member] Limited Partner [Member] | Limited Partner [Member] Redeemable Stock | Limited Partner [Member] Accumulated Distributions in Excess of Net Income | Parent Company [Member] | Parent Company [Member] Preferred Stock Including Additional Paid in Capital [Member] | Parent Company [Member] Preferred Stock [Member] | Parent Company [Member] Common Stock | Parent Company [Member] Common Stock Including Additional Paid in Capital [Member] | Parent Company [Member] Additional Paid-in Capital | Parent Company [Member] Accumulated Distributions in Excess of Net Income | Parent Company [Member] Noncontrolling Interest | Parent Company [Member] Redeemable Stock | Parent Company [Member] Accumulated Other Comprehensive Income (Loss) [Member] | Stockholders' Equity, Total [Member] Limited Partner [Member] | Stockholders' Equity, Total [Member] Parent Company [Member]
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Noncontrolling Interest in Joint Ventures |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  |  |  |  | $ 3.3300 |  |  |  |  |  |  |  |  |  |  |
Shares, Outstanding at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,318,000 |  |  |  |  |  |  |  |
Common stock shares issued (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38,097,000 |  |  |  |  |  |  |  |
Common stock repurchased and retired (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (23,000) |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,000 |  |  |  |  |  |  |  |
Shares, Outstanding at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 113,415,000 |  |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 753,000 |  | $ 3,627,074,000 | $ (634,141,000) | $ 165,726,000 |  | $ (1,589,000) |  | $ 3,157,823,000
Net Income Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 212,222,000 |  |  |  |  |
Net Income Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,180,000 |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  | 224,402,000 |  |  | $ 224,402,000 |  |  |  |  | $ 224,402,000 |  |  |  |  |  |  |  |  |  |  | 224,402,000
Other comprehensive income - derivative instruments (cash flow hedges) |  |  |  |  |  |  | 2,864,000 | $ 2,864,000 |  |  |  |  |  |  |  |  |  |  | 131,000 |  | 2,733,000 |  | 2,864,000
Issuance and registration of common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 380,000 |  | 3,406,150,000 |  | 72,759,000 | $ 1,240,000 |  |  | 3,479,289,000
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 64,833,000
Shares repurchased and retired |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 64,824,000 |  |  |  |  |  | (2,019,000)
Exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | (2,019,000) |  |  |  |  |  |
Shares issued in exchange for units |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 902,000 |  | (902,000) |  |  |  | 0
Stock Issued in Exchange for Redeemable Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 122,000 |  |  |  |  |  |
Redeemable stock fair market value |  |  |  |  |  | $ 705,000 | 705,000 |  |  | $ 705,000 |  |  |  |  |  |  |  | 705,000 |  | 705,000 |  |  | (705,000)
Adjustment for Noncontrolling Interest Ownership in operating partnership |  |  |  |  |  | (323,000) | 0 |  | $ 323,000 |  |  |  |  | $ 0 |  |  | (192,000) |  | 192,000 |  |  |  | 0
Amortization of unearned compensation |  |  |  |  |  | 12,151,000 | 12,151,000 |  |  |  |  |  |  | 0 |  |  | 12,151,000 |  |  |  |  |  | 12,151,000
Dividends, Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 284,548,000 |  |  |  |  |
Payments of Ordinary Dividends |  |  |  |  | $ (226,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Ordinary Dividends, Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  | 13,850,000 |  |  |  |  |  |  | (226,000) |  |  |  | (226,000)
Dividends, Preferred Stock, Cash |  |  |  | 924,000 |  |  |  |  |  |  | $ 307,000 | 924,000 |  |  |  |  |  | 307,000 |  |  |  |  | 307,000
Dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | 0 |  |  |  |  | (284,548,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,133,000 |  | 7,109,012,000 | (707,479,000) | 235,976,000 |  | 1,144,000 |  | 6,642,101,000
Redeemable stock at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  | 8,250,000 |  |  |  |  |  |  |  |  |  | 8,250,000 |  |  |
Redeemable stock at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  | 10,073,000 |  |  |  |  |  |  |  |  |  | 10,073,000 |  |  |
Partners' Capital at Dec. 31, 2015 |  |  |  |  |  | 2,993,696,000 | 3,157,804,000 | (1,618,000) | 165,726,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Allocated to Limited Partners |  |  |  |  |  |  |  |  | 12,180,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Allocated to General Partners |  |  |  |  |  | 211,915,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of units |  |  |  | $ 64,833,000 | 72,759,000 | 3,406,530,000 | 3,544,122,000 |  |  | 1,240,000 | 64,833,000 |  |  |  |  |  |  |  |  |  |  |  |
Units repurchased and retired |  |  |  |  |  | (2,019,000) | (2,019,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General partnership units issued in exchange for limited partnership units |  |  |  |  |  | 902,000 | 0 |  | (902,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units issued in exchange for redeemable units |  |  |  |  |  | 122,000 | 122,000 |  |  | (122,000) |  |  |  |  |  |  |  |  |  | 122,000 |  |  | 122,000
Distributions |  |  |  |  |  | (284,548,000) | (298,432,000) |  | (13,884,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital at Dec. 31, 2016 |  |  |  |  | 235,976,000 | 6,337,721,000 | 6,642,082,000 | 1,246,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on noncontrolling interest units |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  | 13,884,000 |  |  |  | (13,884,000)
Distribution Made to Limited Partner, Distributions Declared, Per Unit |  |  |  | $ 3.3300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | 868,000 |  |  |  |  |  |  |  |  |
Preferred Stock, Value, Outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,000 |  |  |  |  |  |  |  |  |
Noncontrolling Interest in Joint Ventures |  |  |  | $ 2,306,000 |  |  |  |  |  |  |  | $ 2,306,000 |  |  |  |  |  |  |  |  |  |  | 2,306,000
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  |  |  |  | $ 3.5325 |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137,000 |  |  |  |  |  |  |  |
Common stock repurchased and retired (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,000 |  |  |  |  |  |  |  |
Shares, Outstanding at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 113,540,000 |  |  |  |  |  |  |  |
Net Income Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 328,379,000 |  |  |  |  |
Net Income Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,157,000 |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  | 340,536,000 |  |  | 340,536,000 |  |  |  |  | $ 340,536,000 |  | 0 |  |  |  |  |  |  |  |  | 340,536,000
Other comprehensive income - derivative instruments (cash flow hedges) |  |  |  |  |  |  | 1,049,000 | 1,049,000 |  |  |  |  |  | 0 |  |  |  |  | 36,000 |  | 1,013,000 |  | 1,049,000
Issuance and registration of common shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,007,000 | 0 | $ 1,000 | $ 615,000 |  |  | 0 | 1,588,000 |  |  | 616,000
Proceeds from Issuance of Preferred Stock, Preference Stock, and Warrants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,007,000
Shares repurchased and retired |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | (4,782,000) |  |  |  |  |  | (4,782,000)
Exercise of stock options |  | 0 | $ 218,000 |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  | 218,000
Shares issued in exchange for units |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 1,602,000 |  | (1,602,000) |  |  |  | 0
Stock Issued in Exchange for Redeemable Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,482,000 |  |  |  |  |  |
Redeemable stock fair market value |  |  |  |  |  | 229,000 | 229,000 |  |  | 229,000 |  |  |  | 0 |  |  |  | 229,000 |  | 229,000 |  |  | (229,000)
Adjustment for Noncontrolling Interest Ownership in operating partnership |  |  |  |  |  | 6,000 | 0 |  | (6,000) |  |  |  |  | 0 |  |  | 42,000 |  | (42,000) |  |  |  | 0
Amortization of unearned compensation |  |  |  |  |  | 10,802,000 | 10,802,000 |  |  |  |  |  |  | 0 |  |  | 10,916,000 | (114,000) |  |  |  |  | 10,802,000
Payments of Ordinary Dividends, Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  | 14,654,000 |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  | 3,688,000 |  |  | (3,688,000) |  |  |  |  | 3,688,000 |  |  |  |  |  | 3,688,000 |  |  |  |  | 3,688,000
Dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | (401,369,000) |  |  |  |  | (401,369,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  | 6,571,588,000 |  |  | $ 1,134,000 |  | 7,121,112,000 | (784,500,000) | 231,676,000 |  | 2,157,000 |  | 6,573,894,000
Redeemable stock at Dec. 31, 2017 |  |  |  | 10,408,000 |  |  |  |  |  | 10,408,000 |  | $ 10,408,000 |  |  |  |  |  |  |  | 10,408,000 |  |  |
Net Income (Loss) Allocated to Limited Partners |  |  |  |  |  |  |  |  | 12,157,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Allocated to General Partners |  |  |  |  |  | 324,691,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of units |  |  |  | $ 66,840,000 | 0 | 616,000 | 2,623,000 |  |  | 1,588,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Units repurchased and retired |  |  |  |  |  | (4,782,000) | (4,782,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of unit options | $ 218,000 |  |  |  |  |  | 218,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General partnership units issued in exchange for limited partnership units |  |  |  |  |  | 1,602,000 | 0 |  | (1,602,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units issued in exchange for redeemable units |  |  |  |  |  | 1,482,000 | 1,482,000 |  |  | (1,482,000) |  |  |  |  |  |  |  |  |  | 1,482,000 |  |  | 1,482,000
Distributions |  |  |  |  |  | (401,369,000) | (416,218,000) |  | (14,849,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital at Dec. 31, 2017 |  |  |  |  | 231,676,000 | 6,270,758,000 | 6,573,875,000 | 2,295,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends on noncontrolling interest units |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  | (14,849,000) |  |  |  | (14,849,000)
Distribution Made to Limited Partner, Distributions Declared, Per Unit |  |  |  | $ 3.5325 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  | 867,846 |  | 868,000 |  |  |  |  |  |  |  |  |
Preferred Stock, Value, Outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 9,000 |  | $ 9,000 |  |  |  |  |  |  |  |  |
Noncontrolling Interest in Joint Ventures |  |  |  | $ 2,306,000 |  |  |  |  |  |  |  | $ 2,306,000 |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared |  |  |  |  |  |  |  |  |  |  |  | $ 3.7275 |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 142,000 |  |  |  |  |  |  |  |
Common stock repurchased and retired (shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,000 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000 |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Units |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,000 |  |  |  |  |  |  |  |
Shares, Outstanding at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 113,746,000 |  |  |  |  |  |  |  |
Net Income Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 222,899,000 |  |  |  |  |
Net Income Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,123,000 |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  | 231,022,000 |  |  | 231,022,000 |  |  |  |  | $ 231,022,000 |  | 0 |  |  |  |  |  |  |  |  | 231,022,000
Other comprehensive income - derivative instruments (cash flow hedges) |  |  |  |  |  |  | (2,689,000) | (2,689,000) |  |  |  |  |  | 0 |  |  |  |  | (87,000) |  | (2,602,000) |  | (2,689,000)
Issuance and registration of common shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 1,000 | $ (264,000) |  |  | 0 | 1,482,000 |  |  | (263,000)
Shares repurchased and retired |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  | (2,921,000) |  |  |  |  |  | (2,921,000)
Exercise of stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 916,000 |  |  |  |  |  | 916,000
Shares issued in exchange for units |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 1,000 |  | 4,443,000 |  | (4,444,000) |  |  |  | 0
Stock Issued in Exchange for Redeemable Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,915,000 |  |  | (1,915,000) |  |  | 1,915,000
Redeemable stock fair market value |  |  |  |  |  | (561,000) | (561,000) |  |  | (561,000) |  |  |  | 0 |  |  |  | (561,000) |  | (561,000) |  |  | 561,000
Adjustment for Noncontrolling Interest Ownership in operating partnership |  |  |  |  |  | 153,000 | 0 |  | (153,000) |  |  |  |  | 0 |  |  | 66,000 |  | (66,000) |  |  |  | 0
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  |  | (233,000) |  |  |  |  |  |  |  |  |  |  | 0 | (233,000) | 0 |  | 233,000 |  | 0
Amortization of unearned compensation |  |  |  |  |  | 12,904,000 | 12,904,000 |  |  |  |  |  |  | 0 |  |  | 12,903,000 | 0 |  |  |  |  | 12,903,000
Payments of Ordinary Dividends, Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  | 15,079,000 |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  | 3,688,000 |  |  |  |  |  |  |  | 3,688,000 |  |  |  |  |  | 3,688,000 |  |  |  | $ (3,688,000) | (3,688,000)
Dividends on common stock |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  | (424,302,000) |  |  |  |  | (424,302,000)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  | 6,369,883,000 |  |  | $ 1,136,000 |  | $ 7,138,170,000 | $ (989,263,000) | 220,043,000 |  | $ (212,000) |  | 6,372,189,000
Redeemable stock at Dec. 31, 2018 |  |  |  | $ 9,414,000 |  |  |  |  |  | 9,414,000 |  | $ 9,414,000 |  |  |  |  |  |  |  | $ 9,414,000 |  |  |
Net Income (Loss) Allocated to Limited Partners |  |  |  |  |  |  |  |  | 8,123,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Allocated to General Partners |  |  |  |  |  | 219,211,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of units |  |  |  |  |  | (264,000) | (264,000) |  |  | 1,482,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Units repurchased and retired |  |  |  |  |  | (2,921,000) | (2,921,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of unit options |  |  |  |  |  | 916,000 | 916,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General partnership units issued in exchange for limited partnership units |  |  |  |  |  | 4,444,000 | 0 |  | (4,444,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partnership units issued in exchange for redeemable units |  |  |  |  |  | 1,915,000 | 1,915,000 |  |  | $ (1,915,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  | (424,302,000) | (439,461,000) |  | $ (15,159,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital at Dec. 31, 2018 |  |  |  |  | $ 220,043,000 | $ 6,083,142,000 | $ 6,372,170,000 | $ (161,000) |  |  | $ 66,840,000 |  |  |  |  |  |  |  |  |  |  |  |
Dividends on noncontrolling interest units |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  | $ (15,159,000) |  |  |  | $ (15,159,000)
Distribution Made to Limited Partner, Distributions Declared, Per Unit |  |  |  | $ 3.7275 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Outstanding |  |  |  |  |  |  |  |  |  |  |  | 867,846 |  | 868,000 |  |  |  |  |  |  |  |  |
Preferred Stock, Value, Outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 9,000 |  | $ 9,000 |  |  |  |  |  |  |  |  |
Noncontrolling Interest in Joint Ventures |  |  |  | $ 2,306,000 |  |  |  |  |  |  |  | $ 2,306,000 |  |  |  |  |  |  |  |  |  |  |

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