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Consolidated Statements Of Stockholders' Equity - USD ($) | Total | Common Stock [Member] | Preferred Stock [Member] | Additional Paid-In Capital [Member] | Dividends In Excess Of Earnings [Member] | Treasury Stock, At Cost [Member] | Accumulated Other Comprehensive (Income) Loss [Member] | Noncontrolling Interests - Common units [Member] | Noncontrolling interest - property partnerships [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Equity, value at Dec. 31, 2017 | $ 8,102,456,000 | $ 1,543,000 | $ 200,000,000 | $ 6,377,908,000 | $ (712,343,000) | $ (2,722,000) | $ (50,429,000) | $ 604,739,000 | $ 1,683,760,000
Equity, shares at Dec. 31, 2017 |  | 154,325,000 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle | 5,496,000 |  |  |  | 4,933,000 |  |  | 563,000 |
Redemption of operating partnership units to Common Stock, shares |  | 60,000 |  |  |  |  |  |  |
Redemption of operating partnership units to Common Stock, value | 0 | $ 1,000 |  | 2,111,000 |  |  |  | (2,112,000) |
Allocated net income for the year | 527,322,000 |  |  |  | 431,710,000 |  |  | 49,128,000 | 46,484,000
Dividends/distributions declared | (447,342,000) |  |  |  | (401,612,000) |  |  | (45,730,000) |
Shares issued pursuant to stock purchase plan, shares |  | 6,000 |  |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 797,000 |  |  | 797,000 |  |  |  |  |
Net activity from stock option and incentive plan, shares |  | 49,000 |  |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 30,570,000 |  |  | 1,354,000 |  |  |  | 29,216,000 |
Contributions from noncontrolling interests in property partnerships | 37,148,000 |  |  |  |  |  |  |  | 37,148,000
Distributions to noncontrolling interests in property partnerships | (56,796,000) |  |  |  |  |  |  |  | (56,796,000)
Effective portion of interest rate contracts | 1,325,000 |  |  |  |  |  | 1,190,000 | 135,000 | 0
Amortization of interest rate contracts | 4,998,000 |  |  |  |  |  | 4,102,000 | 464,000 | 432,000
Reallocation of noncontrolling interest | 0 |  |  | 18,023,000 |  |  |  | (18,023,000) |
Equity, value at Sep. 30, 2018 | 8,205,974,000 | $ 1,544,000 | 200,000,000 | 6,400,193,000 | (677,312,000) | (2,722,000) | (45,137,000) | 618,380,000 | 1,711,028,000
Equity, shares at Sep. 30, 2018 |  | 154,440,000 |  |  |  |  |  |  |
Equity, value at Jun. 30, 2018 | 8,213,242,000 | $ 1,544,000 | 200,000,000 | 6,391,460,000 | (649,747,000) | (2,722,000) | (47,695,000) | 621,221,000 | 1,699,181,000
Equity, shares at Jun. 30, 2018 |  | 154,412,000 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Redemption of operating partnership units to Common Stock, shares |  | 25,000 |  |  |  |  |  |  |
Redemption of operating partnership units to Common Stock, value | 0 | $ 0 |  | 916,000 |  |  |  | (916,000) |
Allocated net income for the year | 150,445,000 |  |  |  | 121,778,000 |  |  | 13,817,000 | 14,850,000
Dividends/distributions declared | (166,365,000) |  |  |  | (149,343,000) |  |  | (17,022,000) |
Shares issued pursuant to stock purchase plan, shares |  | 3,000 |  |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 368,000 |  |  | 368,000 |  |  |  |  |
Net activity from stock option and incentive plan, shares |  | 0 |  |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 8,440,000 |  |  | 754,000 |  |  |  | 7,686,000 |
Contributions from noncontrolling interests in property partnerships | 9,616,000 |  |  |  |  |  |  |  | 9,616,000
Distributions to noncontrolling interests in property partnerships | (12,763,000) |  |  |  |  |  |  |  | (12,763,000)
Effective portion of interest rate contracts | 1,325,000 |  |  |  |  |  | 1,190,000 | 135,000 |
Amortization of interest rate contracts | 1,666,000 |  |  |  |  |  | 1,368,000 | 154,000 | 144,000
Reallocation of noncontrolling interest | 0 |  |  | 6,695,000 |  |  |  | (6,695,000) |
Equity, value at Sep. 30, 2018 | 8,205,974,000 | $ 1,544,000 | 200,000,000 | 6,400,193,000 | (677,312,000) | (2,722,000) | (45,137,000) | 618,380,000 | 1,711,028,000
Equity, shares at Sep. 30, 2018 |  | 154,440,000 |  |  |  |  |  |  |
Equity, value at Dec. 31, 2018 | $ 8,213,968,000 | $ 1,545,000 | 200,000,000 | 6,407,623,000 | (675,534,000) | (2,722,000) | (47,741,000) | 619,352,000 | 1,711,445,000
Equity, shares at Dec. 31, 2018 | 154,458,478 | 154,458,000 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle | $ (4,379,000) |  |  |  | (3,864,000) |  |  | (445,000) | (70,000)
Redemption of operating partnership units to Common Stock, shares |  | 42,000 |  |  |  |  |  |  |
Redemption of operating partnership units to Common Stock, value | 0 | $ 1,000 |  | 1,434,000 |  |  |  | (1,435,000) |
Allocated net income for the year | 475,990,000 |  |  |  | 378,075,000 |  |  | 43,133,000 | 54,782,000
Dividends/distributions declared | (499,934,000) |  |  |  | (448,343,000) |  |  | (51,591,000) |
Shares issued pursuant to stock purchase plan, shares |  | 6,000 |  |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 688,000 |  |  | 688,000 |  |  |  |  |
Net activity from stock option and incentive plan, shares |  | 66,000 |  |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 26,887,000 |  |  | (2,665,000) |  |  |  | 29,552,000 |
sale of an interest in property partnerships | 0 |  |  | (4,216,000) |  |  |  |  | 4,216,000
Acquisition of noncontrolling interest in property partnership | (186,963,000) |  |  | (162,462,000) |  |  |  |  | (24,501,000)
Contributions from noncontrolling interests in property partnerships | 26,968,000 |  |  |  |  |  |  |  | 26,968,000
Distributions to noncontrolling interests in property partnerships | (53,149,000) |  |  |  |  |  |  |  | (53,149,000)
Effective portion of interest rate contracts | (9,307,000) |  |  |  |  |  | (8,354,000) | (953,000) |
Amortization of interest rate contracts | 4,998,000 |  |  |  |  |  | 4,099,000 | 467,000 | 432,000
Reallocation of noncontrolling interest | 0 |  |  | 34,390,000 |  |  |  | (34,390,000) |
Equity, value at Sep. 30, 2019 | $ 7,995,767,000 | $ 1,546,000 | 200,000,000 | 6,274,792,000 | (749,666,000) | (2,722,000) | (51,996,000) | 603,690,000 | 1,720,123,000
Equity, shares at Sep. 30, 2019 | 154,572,073 | 154,572,000 |  |  |  |  |  |  |
Equity, value at Jun. 30, 2019 | $ 8,020,667,000 | $ 1,546,000 | 200,000,000 | 6,278,961,000 | (710,592,000) | (2,722,000) | (51,340,000) | 608,593,000 | 1,696,221,000
Equity, shares at Jun. 30, 2019 |  | 154,563,000 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle |  |  |  |  |  |  |  |  | 0
Redemption of operating partnership units to Common Stock, shares |  | 7,000 |  |  |  |  |  |  |
Redemption of operating partnership units to Common Stock, value | 0 | $ 0 |  | 223,000 |  |  |  | (223,000) |
Allocated net income for the year | 141,370,000 |  |  |  | 110,394,000 |  |  | 12,506,000 | 18,470,000
Dividends/distributions declared | (166,668,000) |  |  |  | (149,468,000) |  |  | (17,200,000) |
Shares issued pursuant to stock purchase plan, shares |  | 2,000 |  |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 315,000 |  |  | 315,000 |  |  |  |  |
Net activity from stock option and incentive plan, shares |  | 0 |  |  |  |  |  |  |
Net activity from stock option and incentive plan, value | (445,000) |  |  | (7,219,000) |  |  |  | 6,774,000 |
sale of an interest in property partnerships | 0 |  |  | (4,216,000) |  |  |  |  | 4,216,000
Acquisition of noncontrolling interest in property partnership | 43,000 |  |  | 43,000 |  |  |  |  |
Contributions from noncontrolling interests in property partnerships | 14,820,000 |  |  |  |  |  |  |  | 14,820,000
Distributions to noncontrolling interests in property partnerships | (13,748,000) |  |  |  |  |  |  |  | (13,748,000)
Effective portion of interest rate contracts | (2,253,000) |  |  |  |  |  | (2,022,000) | (231,000) |
Amortization of interest rate contracts | 1,666,000 |  |  |  |  |  | 1,366,000 | 156,000 | 144,000
Reallocation of noncontrolling interest | 0 |  |  | 6,685,000 |  |  |  | (6,685,000) |
Equity, value at Sep. 30, 2019 | $ 7,995,767,000 | $ 1,546,000 | $ 200,000,000 | $ 6,274,792,000 | $ (749,666,000) | $ (2,722,000) | $ (51,996,000) | $ 603,690,000 | $ 1,720,123,000
Equity, shares at Sep. 30, 2019 | 154,572,073 | 154,572,000 |  |  |  |  |  |  |

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