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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, 2014 | $ 7,902,936 | $ 1,531 | $ 200,000 | $ 6,270,257 | $ (762,464) | $ (2,722) | $ (9,304) | $ 2,205,638
Equity, shares at Dec. 31, 2014 |  | 153,114,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, shares |  | 259,000 |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, value | 0 | $ 3 |  | 8,686 |  |  |  | (8,689)
Allocated net income for the year | 206,939 |  |  |  | 173,771 |  |  | 33,168
Dividends/distributions declared | (114,005) |  |  |  | (102,300) |  |  |
Dividends/distributions declared |  |  |  |  |  |  |  | (11,705)
Shares issued pursuant to stock purchase plan, shares |  | 2,000 |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 313 |  |  | 313 |  |  |  |
Net activity from stock option and incentive plan, shares |  | 27,000 |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 21,616 | $ 0 |  | 1,842 |  |  |  | 19,774
Contributions from noncontrolling interests in property partnerships | 629 |  |  |  |  |  |  | 629
Distributions to noncontrolling interests in property partnerships | (16,574) |  |  |  |  |  |  | (16,574)
Effective portion of interest rate contracts | (3,533) |  |  |  |  |  | (3,165) | (368)
Amortization of interest rate contracts | 627 |  |  |  |  |  | 562 | 65
Reallocation of noncontrolling interest | 0 |  |  | 5,162 |  |  |  | (5,162)
Equity, value at Mar. 31, 2015 | 7,998,948 | $ 1,534 | 200,000 | 6,286,260 | (690,993) | (2,722) | (11,907) | 2,216,776
Equity, shares at Mar. 31, 2015 |  | 153,402,000 |  |  |  |  |  |
Equity, value at Dec. 31, 2015 | $ 7,886,927 | $ 1,536 | 200,000 | 6,305,687 | (780,952) | (2,722) | (14,114) | 2,177,492
Equity, shares at Dec. 31, 2015 | 153,579,966 | 153,580,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, shares |  | 13,000 |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, value |  | $ 0 |  | 446 |  |  |  | (446)
Allocated net income for the year | $ 216,222 |  |  |  | 184,365 |  |  | 31,857
Dividends/distributions declared | (114,326) |  |  |  | (102,461) |  |  |
Dividends/distributions declared |  |  |  |  |  |  |  | (11,865)
Shares issued pursuant to stock purchase plan, shares |  | 3,000 |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 332 |  |  | 332 |  |  |  |
Net activity from stock option and incentive plan, shares |  | 9,000 |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 9,080 |  |  | 696 |  |  |  | 8,384
Contributions from noncontrolling interests in property partnerships | 2,489 |  |  |  |  |  |  | 2,489
Distributions to noncontrolling interests in property partnerships | (12,915) |  |  |  |  |  |  | (12,915)
Effective portion of interest rate contracts | (58,646) |  |  |  |  |  | (43,154) | (15,492)
Amortization of interest rate contracts | 627 |  |  |  |  |  | 562 | 65
Reallocation of noncontrolling interest |  |  |  | (438) |  |  |  | 438
Equity, value at Mar. 31, 2016 | $ 7,929,790 | $ 1,536 | $ 200,000 | $ 6,306,723 | $ (699,048) | $ (2,722) | $ (56,706) | $ 2,180,007
Equity, shares at Mar. 31, 2016 | 153,604,966 | 153,605,000 |  |  |  |  |  |

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