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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 |  | 322,000 |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, value | 0 | $ 4 |  | 10,839 |  |  |  | (10,843)
Allocated net income for the year | 305,462 |  |  |  | 255,901 |  |  | 49,561
Dividends/distributions declared | (228,254) |  |  |  | (204,676) |  |  |
Dividends/distributions declared |  |  |  |  |  |  |  | (23,578)
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 |  | 36,000 |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 27,562 | $ 0 |  | 3,407 |  |  |  | 24,155
Contributions from noncontrolling interests in property partnerships | 1,089 |  |  |  |  |  |  | 1,089
Distributions to noncontrolling interests in property partnerships | (34,022) |  |  |  |  |  |  | (34,022)
Effective portion of interest rate contracts | 12,106 |  |  |  |  |  | 10,027 | 2,079
Amortization of interest rate contracts | 1,255 |  |  |  |  |  | 1,125 | 130
Reallocation of noncontrolling interest | 0 |  |  | 8,740 |  |  |  | (8,740)
Equity, value at Jun. 30, 2015 | 7,988,447 | $ 1,535 | 200,000 | 6,293,556 | (711,239) | (2,722) | 1,848 | 2,205,469
Equity, shares at Jun. 30, 2015 |  | 153,474,000 |  |  |  |  |  |
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 |  | 78,000 |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, value |  | $ 1 |  | 2,663 |  |  |  | (2,664)
Allocated net income for the year | $ 333,579 |  |  |  | 283,530 |  |  | 50,049
Dividends/distributions declared | (228,652) |  |  |  | (204,939) |  |  |
Dividends/distributions declared |  |  |  |  |  |  |  | (23,713)
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 |  | 14,000 |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 16,649 |  |  | 1,772 |  |  |  | 14,877
Sale of an interest in property partnerships | 0 |  |  | 1,320 |  |  |  | (1,320)
Contributions from noncontrolling interests in property partnerships | 5,040 |  |  |  |  |  |  | 5,040
Distributions to noncontrolling interests in property partnerships | (25,914) |  |  |  |  |  |  | (25,914)
Effective portion of interest rate contracts | (90,997) |  |  |  |  |  | (66,759) | (24,238)
Amortization of interest rate contracts | 1,255 |  |  |  |  |  | 1,125 | 130
Reallocation of noncontrolling interest |  |  |  | 4,417 |  |  |  | (4,417)
Equity, value at Jun. 30, 2016 | $ 7,898,219 | $ 1,537 | $ 200,000 | $ 6,316,191 | $ (702,361) | $ (2,722) | $ (79,748) | $ 2,165,322
Equity, shares at Jun. 30, 2016 | 153,674,930 | 153,675,000 |  |  |  |  |  |

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