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Consolidated Statements of Equity - USD ($) $ in Thousands | Total | Limited Partner [Member] | General Partner [Member] | AOCI Attributable to Noncontrolling Interest [Member] | Noncontrolling Interests-Consolidated Real Estate Entities [Member] | Redeemable Common Stock [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] General Partner [Member] | Revision of Prior Period, Accounting Standards Update, Adjustment [Member] AOCI Attributable to Noncontrolling Interest [Member] | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Distributions in Excess Of Net Income [Member] | Accumulated Distributions in Excess Of Net Income [Member] Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | Accumulated Other Comprehensive (Loss) Income [Member] | Accumulated Other Comprehensive (Loss) Income [Member] Revision of Prior Period, Accounting Standards Update, Adjustment [Member] | Noncontrolling Interests Operating Partnership [Member] | Noncontrolling Interests-Consolidated Real Estate Entities [Member] | Redeemable Common Stock [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 | $ 6,573,894 |  |  |  |  |  |  |  | $ 9 | $ 1,134 | $ 7,121,112 | $ (784,500) |  | $ 2,157 |  | $ 231,676 | $ 2,306 | $ 10,408
Beginning Balance, Shares at Dec. 31, 2017 |  |  |  |  |  |  |  |  | 868,000 | 113,540,000 |  |  |  |  |  |  |  |
Net income | 231,022 | $ 8,123 |  |  |  |  |  |  |  |  |  | 222,899 |  |  |  | 8,123 |  |
Other comprehensive Income (loss) - derivative instruments | (2,689) |  |  | $ (2,689) |  |  |  |  |  |  |  |  |  | $ (2,602) |  | (87) |  |
Issuance and registration of common shares | (263) |  |  |  |  |  |  |  |  | $ 1 | (264) |  |  |  |  |  |  | 1,482
Issuance and registration of common shares, Shares |  |  |  |  |  |  |  |  |  | 142,000 |  |  |  |  |  |  |  |
Shares repurchased and retired | (2,921) |  | $ (2,921) |  |  |  |  |  |  |  | (2,921) |  |  |  |  |  |  |
Shares repurchased and retired, Shares |  |  |  |  |  |  |  |  |  | (34,000) |  |  |  |  |  |  |  |
Exercise of stock options | 916 |  | 916 |  |  |  |  |  |  |  | 916 |  |  |  |  |  |  |
Exercise of stock options, Shares |  |  |  |  |  |  |  |  |  | 18,000 |  |  |  |  |  |  |  |
Shares issued in exchange for common units |  |  |  |  |  |  |  |  |  | $ 1 | 4,443 |  |  |  |  | (4,444) |  |
Shares issued in exchange for common units, Shares |  |  |  |  |  |  |  |  |  | 80,000 |  |  |  |  |  |  |  |
Shares issued in exchange for redeemable stock | 1,915 |  | 1,915 |  |  | $ (1,915) |  |  |  |  | 1,915 |  |  |  |  |  |  | (1,915)
Redeemable stock fair market value adjustment | 561 |  | 561 |  |  | (561) |  |  |  |  |  | $ 561 |  |  |  |  |  | (561)
Adjustment for noncontrolling interests in Operating Partnership |  | $ (153) | $ 153 |  |  |  |  |  |  |  | $ 66 |  |  |  |  | $ (66) |  |
Cumulative adjustment due to adoption of ASU 2017-12 |  |  |  |  |  |  |  |  |  |  |  |  | $ (233) |  | $ 233 |  |  |
Accounting Standards Update [Extensible List] |  | us-gaap:AccountingStandardsUpdate201712Member | us-gaap:AccountingStandardsUpdate201712Member | us-gaap:AccountingStandardsUpdate201712Member |  |  |  |  |  |  | us-gaap:AccountingStandardsUpdate201712Member | us-gaap:AccountingStandardsUpdate201712Member |  | us-gaap:AccountingStandardsUpdate201712Member |  | us-gaap:AccountingStandardsUpdate201712Member |  |
Amortization of unearned compensation | 12,903 |  |  |  |  |  |  |  |  |  | $ 12,903 |  |  |  |  |  |  |
Dividends on preferred stock | (3,688) |  |  |  |  |  |  |  |  |  |  | $ (3,688) |  |  |  |  |  |
Dividends on common stock | (424,302) |  |  |  |  |  |  |  |  |  |  | (424,302) |  |  |  |  |  |
Dividends on noncontrolling interests units | (15,159) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (15,159) |  |
Ending Balance at Dec. 31, 2018 | 6,372,189 |  |  |  |  |  |  |  | $ 9 | $ 1,136 | 7,138,170 | (989,263) |  | $ (212) |  | 220,043 | 2,306 | 9,414
Ending Balance, Shares at Dec. 31, 2018 |  |  |  |  |  |  |  |  | 868,000 | 113,746,000 |  |  |  |  |  |  |  |
Partners' Capital at Dec. 31, 2017 | 6,573,875 | $ 231,676 | $ 6,270,758 | $ 2,295 | $ 2,306 | 10,408 |  |  |  |  |  | 66,840 |  |  |  |  |  |
Net Income (Loss) Allocated to General Partners |  |  | 219,211 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash | 3,688 |  |  |  |  |  |  |  |  |  |  | 3,688 |  |  |  |  |  |
Issuance of units | (264) |  | (264) |  |  | 1,482 |  |  |  |  |  |  |  |  |  |  |  |
General partner units issued in exchange for limited partner units |  | (4,444) | 4,444 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital at Dec. 31, 2018 |  |  |  |  |  |  | $ (233) | $ 233 |  |  |  |  |  |  |  |  |  |
Amortization of unearned compensation | 12,904 |  | 12,904 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash | (3,688) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to common unitholders | (439,461) | (15,159) | (424,302) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital at Dec. 31, 2018 | 6,372,170 | 220,043 | 6,083,142 | (161) | 2,306 | 9,414 |  |  |  |  |  | 66,840 |  |  |  |  |  |
Net income | 366,618 | 12,671 |  |  | 136 |  |  |  |  |  |  | 353,811 |  |  |  | 12,671 | 136 |
Other comprehensive Income (loss) - derivative instruments | (13,423) |  |  | (13,423) |  |  |  |  |  |  |  |  |  | (12,966) |  | (457) |  |
Issuance and registration of common shares | 20,500 |  |  |  |  |  |  |  |  | $ 4 | 20,496 |  |  |  |  |  |  | 1,651
Issuance and registration of common shares, Shares |  |  |  |  |  |  |  |  |  | 338,000 |  |  |  |  |  |  |  |
Shares repurchased and retired | (3,724) |  | (3,724) |  |  |  |  |  |  |  | (3,724) |  |  |  |  |  |  |
Shares repurchased and retired, Shares |  |  |  |  |  |  |  |  |  | (37,000) |  |  |  |  |  |  |  |
Exercise of stock options | 2,881 |  | 2,881 |  |  |  |  |  |  |  | 2,881 |  |  |  |  |  |  |
Exercise of stock options, Shares |  |  |  |  |  |  |  |  |  | 48,000 |  |  |  |  |  |  |  |
Shares issued in exchange for common units |  |  |  |  |  |  |  |  |  |  | 2,366 |  |  |  |  | (2,366) |  |
Shares issued in exchange for common units, Shares |  |  |  |  |  |  |  |  |  | 44,000 |  |  |  |  |  |  |  |
Shares issued in exchange for redeemable stock | 575 |  | 575 |  |  | (575) |  |  |  |  | 575 |  |  |  |  |  |  | (575)
Redeemable stock fair market value adjustment | (3,641) |  | (3,641) |  |  | 3,641 |  |  |  |  |  | (3,641) |  |  |  |  |  | 3,641
Adjustment for noncontrolling interests in Operating Partnership | 6,126 | 359 | (359) |  | 6,126 |  |  |  |  |  | (816) |  |  |  |  | 816 |  |
Amortization of unearned compensation | 14,684 |  |  |  |  |  |  |  |  |  | 14,684 |  |  |  |  |  |  |
Dividends on preferred stock | (3,688) |  |  |  |  |  |  |  |  |  |  | (3,688) |  |  |  |  |  |
Dividends on common stock | (442,698) |  |  |  |  |  |  |  |  |  |  | (442,698) |  |  |  |  |  |
Dividends on noncontrolling interests units | (16,060) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,060) |  |
Acquisition of noncontrolling interest | (10,880) |  | (8,559) |  | (2,321) |  |  |  |  |  | (8,559) |  |  |  |  |  | (2,321) |
Contributions from noncontrolling interest | 6,126 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,126 |
Ending Balance at Dec. 31, 2019 | 6,289,459 |  |  |  |  |  |  |  | $ 9 | $ 1,140 | 7,166,073 | (1,085,479) |  | (13,178) |  | 214,647 | 6,247 | 14,131
Ending Balance, Shares at Dec. 31, 2019 |  |  |  |  |  |  |  |  | 868,000 | 114,139,000 |  |  |  |  |  |  |  |
Net Income (Loss) Allocated to General Partners |  |  | 350,123 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash | 3,688 |  |  |  |  |  |  |  |  |  |  | 3,688 |  |  |  |  |  |
Issuance of units | 20,500 |  | 20,500 |  |  | 1,651 |  |  |  |  |  |  |  |  |  |  |  |
General partner units issued in exchange for limited partner units |  | (2,366) | 2,366 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital at Dec. 31, 2019 | 6,289,440 | 214,647 | 6,015,290 | (13,584) | 6,247 | 14,131 |  |  |  |  |  | 66,840 |  |  |  |  |  |
Amortization of unearned compensation | 14,684 |  | 14,684 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash | (3,688) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to common unitholders | (458,758) | (16,060) | (442,698) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 264,015 | 9,053 |  |  |  |  |  |  |  |  |  | 254,962 |  |  |  | 9,053 |  |
Other comprehensive Income (loss) - derivative instruments | 1,088 |  |  | 1,088 |  |  |  |  |  |  |  |  |  | 1,050 |  | 38 |  |
Issuance and registration of common shares | (208) |  |  |  |  |  |  |  |  | $ 1 | (209) |  |  |  |  |  |  | 1,629
Issuance and registration of common shares, Shares |  |  |  |  |  |  |  |  |  | 157,000 |  |  |  |  |  |  |  |
Shares repurchased and retired | (5,657) |  | (5,657) |  |  |  |  |  |  |  | (5,657) |  |  |  |  |  |  |
Shares repurchased and retired, Shares |  |  |  |  |  |  |  |  |  | (55,000) |  |  |  |  |  |  |  |
Exercise of stock options | $ 71 |  | 71 |  |  |  |  |  |  |  | 71 |  |  |  |  |  |  |
Exercise of stock options, Shares | 918 |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |
Shares issued in exchange for common units |  |  |  |  |  |  |  |  |  |  | 502 |  |  |  |  | (502) |  |
Shares issued in exchange for common units, Shares |  |  |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |
Redeemable stock fair market value adjustment | $ 363 |  | 363 |  |  | (363) |  |  |  |  |  | 363 |  |  |  |  |  | (363)
Adjustment for noncontrolling interests in Operating Partnership | 3,601 | 63 | (63) |  | 3,601 |  |  |  |  |  | (25) |  |  |  |  | 25 |  |
Amortization of unearned compensation | 16,038 |  |  |  |  |  |  |  |  |  | 16,038 |  |  |  |  |  |  |
Dividends on preferred stock | (3,688) |  |  |  |  |  |  |  |  |  |  | (3,688) |  |  |  |  |  |
Dividends on common stock | (460,340) |  |  |  |  |  |  |  |  |  |  | (460,340) |  |  |  |  |  |
Dividends on noncontrolling interests units | (16,334) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,334) |  |
Contributions from noncontrolling interest | 3,601 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,601 |
Ending Balance at Dec. 31, 2020 | 6,088,408 |  |  |  |  |  |  |  | $ 9 | $ 1,141 | $ 7,176,793 | (1,294,182) |  | $ (12,128) |  | $ 206,927 | $ 9,848 | $ 15,397
Ending Balance, Shares at Dec. 31, 2020 |  |  |  |  |  |  |  |  | 868,000 | 114,252,000 |  |  |  |  |  |  |  |
Net Income (Loss) Allocated to General Partners |  |  | 251,274 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash | 3,688 |  |  |  |  |  |  |  |  |  |  | 3,688 |  |  |  |  |  |
Issuance of units | (208) |  | (208) |  |  | 1,629 |  |  |  |  |  |  |  |  |  |  |  |
General partner units issued in exchange for limited partner units |  | (502) | 502 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital at Dec. 31, 2020 | 6,088,389 | 206,927 | 5,817,270 | $ (12,496) | $ 9,848 | $ 15,397 |  |  |  |  |  | $ 66,840 |  |  |  |  |  |
Amortization of unearned compensation | 16,038 |  | 16,038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash | (3,688) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to common unitholders | $ (476,674) | $ (16,334) | $ (460,340) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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