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Consolidated Statements Of Equity - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock [Member] | Preferred Stock [Member] | Additional Paid-In Capital [Member] | Dividends In Excess Of Earnings [Member] | Dividends In Excess Of Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment | Treasury Stock, at cost [Member] | Accumulated Other Comprehensive Loss [Member] | Noncontrolling Interests [Member] | Noncontrolling Interests [Member] Cumulative Effect, Period of Adoption, Adjustment | Noncontrolling interest - property partnerships [Member] | Noncontrolling interest - property partnerships [Member] Cumulative Effect, Period of Adoption, Adjustment
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Equity, shares at Dec. 31, 2017 |  |  | 154,325,000 |  |  |  |  |  |  |  |  |  |
Equity, value at Dec. 31, 2017 | $ 8,102,456 | $ 5,496 | $ 1,543 | $ 200,000 | $ 6,377,908 | $ (712,343) | $ 4,933 | $ (2,722) | $ (50,429) | $ 604,739 | $ 563 | $ 1,683,760 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption of operating partnership units to common stock, shares |  |  | 83,000 |  |  |  |  |  |  |  |  |  |
Redemption of operating partnership units to common stock, value | 0 |  | $ 2 |  | 2,878 |  |  |  |  | (2,880) |  |  |
Allocated net income for the year | 712,563 |  |  |  |  | 582,847 |  |  |  | 66,807 |  | 62,909 |
Dividends/distributions declared | (613,702) |  |  |  |  | (550,971) |  |  |  | (62,731) |  |  |
Shares issued pursuant to stock purchase plan, shares |  |  | 6,000 |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 797 |  |  |  | 797 |  |  |  |  |  |  |  |
Net activity from stock option and incentive plan, shares |  |  | 44,000 |  |  |  |  |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 38,590 |  | $ 0 |  | 1,729 |  |  |  |  | 36,861 |  |  |
Contributions from noncontrolling interests in property partnerships | 46,701 |  |  |  |  |  |  |  |  |  |  | 46,701 |
Distributions to noncontrolling interests in property partnerships | (82,501) |  |  |  |  |  |  |  |  |  |  | (82,501) |
Effective portion of interest rate contracts | (3,096) |  |  |  |  |  |  |  | (2,781) | (315) |  | 0 |
Amortization of interest rate contracts | 6,664 |  |  |  |  |  |  |  | 5,469 | 619 |  | 576 |
Reallocation of noncontrolling interest | 0 |  |  |  | 24,311 |  |  |  |  | (24,311) |  |  |
Equity, shares at Dec. 31, 2018 |  |  | 154,458,000 |  |  |  |  |  |  |  |  |  |
Equity, value at Dec. 31, 2018 | $ 8,213,968 | (4,379) | $ 1,545 | 200,000 | 6,407,623 | (675,534) | (3,864) | (2,722) | (47,741) | 619,352 | (445) | 1,711,445 | $ (70)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | Accounting Standards Update 2014-09 | us-gaap:AccountingStandardsUpdate201409Member |  |  |  |  |  |  |  |  |  |  |  |
Redemption of operating partnership units to common stock, shares |  |  | 145,000 |  |  |  |  |  |  |  |  |  |
Redemption of operating partnership units to common stock, value | $ 0 |  | $ 2 |  | 4,883 |  |  |  |  | (4,885) |  |  |
Allocated net income for the year | 651,999 |  |  |  |  | 521,534 |  |  |  | 59,345 |  | 71,120 |
Dividends/distributions declared | (671,893) |  |  |  |  | (602,659) |  |  |  | (69,234) |  |  |
Shares issued pursuant to stock purchase plan, shares |  |  | 6,000 |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 688 |  |  |  | 688 |  |  |  |  |  |  |  |
Net activity from stock option and incentive plan, shares |  |  | 181,000 |  |  |  |  |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 45,000 |  | $ 1 |  | 8,771 |  |  |  |  | 36,228 |  |  |
Sale of an interest in property partnerships | 0 |  |  |  | (4,216) |  |  |  |  |  |  | 4,216 |
Acquisition of noncontrolling interest in property partnership | (186,963) |  |  |  | (162,462) |  |  |  |  |  |  | (24,501) |
Contributions from noncontrolling interests in property partnerships | 35,816 |  |  |  |  |  |  |  |  |  |  | 35,816 |
Distributions to noncontrolling interests in property partnerships | (69,913) |  |  |  |  |  |  |  |  |  |  | (69,913) |
Effective portion of interest rate contracts | (6,751) |  |  |  |  |  |  |  | (6,060) | (691) |  | 0 |
Amortization of interest rate contracts | 6,664 |  |  |  |  |  |  |  | 5,466 | 622 |  | 576 |
Reallocation of noncontrolling interest | $ 0 |  |  |  | 39,432 |  |  |  |  | (39,432) |  |  |
Equity, shares at Dec. 31, 2019 | 154,790,298 |  | 154,790,000 |  |  |  |  |  |  |  |  |  |
Equity, value at Dec. 31, 2019 | $ 8,014,236 | $ (1,679) | $ 1,548 | 200,000 | 6,294,719 | (760,523) | $ (1,505) | (2,722) | (48,335) | 600,860 | $ (174) | 1,728,689 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | Accounting Standards Update 2016-02 | us-gaap:AccountingStandardsUpdate201602Member |  |  |  |  |  |  |  |  |  |  |  |
Redemption of operating partnership units to common stock, shares |  |  | 857,000 |  |  |  |  |  |  |  |  |  |
Redemption of operating partnership units to common stock, value | $ 0 |  | $ 9 |  | 29,689 |  |  |  |  | (29,698) |  |  |
Allocated net income for the year | 1,018,691 |  |  |  |  | 872,727 |  |  |  | 97,704 |  | 48,260 |
Dividends/distributions declared | (689,273) |  |  |  |  | (620,352) |  |  |  | (68,921) |  |  |
Shares issued pursuant to stock purchase plan, shares |  |  | 7,000 |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 759 |  |  |  | 759 |  |  |  |  |  |  |  |
Net activity from stock option and incentive plan, shares |  |  | 65,000 |  |  |  |  |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 48,621 |  | $ 0 |  | 9,303 |  |  |  |  | 39,318 |  |  |
Contributions from noncontrolling interests in property partnerships | 8,219 |  |  |  |  |  |  |  |  |  |  | 8,219 |
Distributions to noncontrolling interests in property partnerships | (58,811) |  |  |  |  |  |  |  |  |  |  | (58,811) |
Effective portion of interest rate contracts | (7,848) |  |  |  |  |  |  |  | (7,066) | (782) |  | 0 |
Amortization of interest rate contracts | 6,697 |  |  |  |  |  |  |  | 5,511 | 610 |  | 576 |
Reallocation of noncontrolling interest | $ 0 |  |  |  | 22,321 |  |  |  |  | (22,321) |  |  |
Equity, shares at Dec. 31, 2020 | 155,718,825 |  | 155,719,000 |  |  |  |  |  |  |  |  |  |
Equity, value at Dec. 31, 2020 | $ 8,339,612 |  | $ 1,557 | $ 200,000 | $ 6,356,791 | $ (509,653) |  | $ (2,722) | $ (49,890) | $ 616,596 |  | $ 1,726,933 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | Accounting Standards Update 2018-09 | us-gaap:AccountingStandardsUpdate201809Member |  |  |  |  |  |  |  |  |  |  |  |

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