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Consolidated Statements Of Stockholders' Equity - USD ($) $ in Thousands | 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 [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Equity, value at Dec. 31, 2016 | $ 7,931,924 | $ 1,538 | $ 200,000 | $ 6,333,424 | $ (693,694) | $ (2,722) | $ (52,251) | $ 2,145,629
Equity, shares at Dec. 31, 2016 |  | 153,790,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, shares |  | 492,000 |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, value | 0 | $ 5 |  | 16,807 |  |  |  | (16,812)
Allocated net income for the year | 430,278 |  |  |  | 355,961 |  |  | 74,317
Dividends/distributions declared | (395,026) |  |  |  | (354,734) |  |  | (40,292)
Shares issued pursuant to stock purchase plan, shares |  | 6,000 |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 795 |  |  | 795 |  |  |  |
Net activity from stock option and incentive plan, shares |  | 34,000 |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 29,191 | $ 0 |  | 2,920 |  |  |  | 26,271
Cumulative effect of a change in accounting principle | (2,035) |  |  |  | (272) |  |  | (1,763)
Contributions from noncontrolling interests in property partnerships | 147,772 |  |  |  |  |  |  | 147,772
Distributions to noncontrolling interests in property partnerships | (41,439) |  |  |  |  |  |  | (41,439)
Effective portion of interest rate contracts | (6,133) |  |  |  |  |  | (3,304) | (2,829)
Amortization of interest rate contracts | 4,368 |  |  |  |  |  | 3,759 | 609
Reallocation of noncontrolling interest | 0 |  |  | 16,986 |  |  |  | (16,986)
Equity, value at Sep. 30, 2017 | 8,099,695 | $ 1,543 | 200,000 | 6,370,932 | (692,739) | (2,722) | (51,796) | 2,274,477
Equity, shares at Sep. 30, 2017 |  | 154,322,000 |  |  |  |  |  |
Equity, value at Dec. 31, 2017 | $ 8,102,456 | $ 1,543 | 200,000 | 6,377,908 | (712,343) | (2,722) | (50,429) | 2,288,499
Equity, shares at Dec. 31, 2017 | 154,325,286 | 154,325,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, shares |  | 60,000 |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, value |  | $ 1 |  | 2,111 |  |  |  | (2,112)
Allocated net income for the year | $ 527,322 |  |  |  | 431,710 |  |  | 95,612
Dividends/distributions declared | (447,342) |  |  |  | (401,612) |  |  | (45,730)
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 |  | 49,000 |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 30,570 |  |  | 1,354 |  |  |  | 29,216
Cumulative effect of a change in accounting principle | 5,496 |  |  |  | 4,933 |  |  | 563
Contributions from noncontrolling interests in property partnerships | 37,148 |  |  |  |  |  |  | 37,148
Distributions to noncontrolling interests in property partnerships | (56,796) |  |  |  |  |  |  | (56,796)
Effective portion of interest rate contracts | 1,325 |  |  |  |  |  | 1,190 | 135
Amortization of interest rate contracts | 4,998 |  |  |  |  |  | 4,102 | 896
Reallocation of noncontrolling interest |  |  |  | 18,023 |  |  |  | (18,023)
Equity, value at Sep. 30, 2018 | $ 8,205,974 | $ 1,544 | $ 200,000 | $ 6,400,193 | $ (677,312) | $ (2,722) | $ (45,137) | $ 2,329,408
Equity, shares at Sep. 30, 2018 | 154,440,239 | 154,440,000 |  |  |  |  |  |

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