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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 |  | 481,000 |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, value | 0 | $ 5 |  | 16,417 |  |  |  | (16,422)
Allocated net income for the year | 282,574 |  |  |  | 236,014 |  |  | 46,560
Dividends/distributions declared | (263,345) |  |  |  | (236,368) |  |  | (26,977)
Shares issued pursuant to stock purchase plan, shares |  | 3,000 |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 373 |  |  | 373 |  |  |  |
Net activity from stock option and incentive plan, shares |  | 34,000 |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 21,168 | $ 0 |  | 1,980 |  |  |  | 19,188
Cumulative effect of a change in accounting principle | (2,035) |  |  |  | (272) |  |  | (1,763)
Contributions from noncontrolling interests in property partnerships | 133,072 |  |  |  |  |  |  | 133,072
Distributions to noncontrolling interests in property partnerships | (26,949) |  |  |  |  |  |  | (26,949)
Effective portion of interest rate contracts | (6,133) |  |  |  |  |  | (3,301) | (2,832)
Amortization of interest rate contracts | 2,703 |  |  |  |  |  | 2,391 | 312
Reallocation of noncontrolling interest | 0 |  |  | 10,840 |  |  |  | (10,840)
Equity, value at Jun. 30, 2017 | 8,073,352 | $ 1,543 | 200,000 | 6,363,034 | (694,320) | (2,722) | (53,161) | 2,258,978
Equity, shares at Jun. 30, 2017 |  | 154,308,000 |  |  |  |  |  |
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 |  | 35,000 |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, value |  | $ 1 |  | 1,195 |  |  |  | (1,196)
Allocated net income for the year | $ 376,877 |  |  |  | 309,932 |  |  | 66,945
Dividends/distributions declared | (280,977) |  |  |  | (252,269) |  |  | (28,708)
Shares issued pursuant to stock purchase plan, shares |  | 3,000 |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 429 |  |  | 429 |  |  |  |
Net activity from stock option and incentive plan, shares |  | 49,000 |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 22,130 |  |  | 600 |  |  |  | 21,530
Cumulative effect of a change in accounting principle | 5,496 |  |  |  | 4,933 |  |  | 563
Contributions from noncontrolling interests in property partnerships | 27,532 |  |  |  |  |  |  | 27,532
Distributions to noncontrolling interests in property partnerships | (44,033) |  |  |  |  |  |  | (44,033)
Amortization of interest rate contracts | 3,332 |  |  |  |  |  | 2,734 | 598
Reallocation of noncontrolling interest |  |  |  | 11,328 |  |  |  | (11,328)
Equity, value at Jun. 30, 2018 | $ 8,213,242 | $ 1,544 | $ 200,000 | $ 6,391,460 | $ (649,747) | $ (2,722) | $ (47,695) | $ 2,320,402
Equity, shares at Jun. 30, 2018 | 154,411,529 | 154,412,000 |  |  |  |  |  |

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