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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 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] |  |  |  |  |  |  |  |
Redemption of operating partnership units to common stock |  | 424,000 |  |  |  |  |  |
Redemption of operating partnership units to common stock | 0 | $ 5 |  | 14,338 |  |  |  | (14,343)
Allocated net income for the year | 794,791 |  |  |  | 583,106 |  |  | 211,685
Dividends/distributions declared | (671,041) |  |  |  | (601,594) |  |  | (69,447)
Shares issued pursuant to stock purchase plan, shares |  | 6,000 |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 780 |  |  | 780 |  |  |  |
Net activity from stock option and incentive plan, shares |  | 36,000 |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 40,265 |  |  | 5,814 |  |  |  | 34,451
Acquisition of redeemable noncontrolling interest in property partnership | (1,586) |  |  | (1,586) |  |  |  |
Sale of interests in property partnerships | 0 |  |  | (1,053) |  |  |  | 1,053
Contributions from noncontrolling interests in property partnerships | 2,705 |  |  |  |  |  |  | 2,705
Distributions to noncontrolling interests in property partnerships | (170,049) |  |  |  |  |  |  | (170,049)
Dissolution of property partnership | (4,082) |  |  |  |  |  |  | (4,082)
Effective portion of interest rate contracts | (10,302) |  |  |  |  |  | (7,061) | (3,241)
Amortization of interest rate contracts | 2,510 |  |  |  |  |  | 2,251 | 259
Reallocation of noncontrolling interest | 0 |  |  | 17,137 |  |  |  | (17,137)
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 |  | 153,580,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Redemption of operating partnership units to common stock |  | 191,000 |  |  |  |  |  |
Redemption of operating partnership units to common stock | 0 | $ 2 |  | 6,459 |  |  |  | (6,461)
Allocated net income for the year | 569,977 |  |  |  | 512,785 |  |  | 57,192
Dividends/distributions declared | (474,614) |  |  |  | (425,527) |  |  | (49,087)
Shares issued pursuant to stock purchase plan, shares |  | 6,000 |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 730 |  |  | 730 |  |  |  |
Net activity from stock option and incentive plan, shares |  | 13,000 |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 31,910 |  |  | 3,979 |  |  |  | 27,931
Sale of interests in property partnerships | 0 |  |  | 1,195 |  |  |  | (1,195)
Contributions from noncontrolling interests in property partnerships | 11,951 |  |  |  |  |  |  | 11,951
Distributions to noncontrolling interests in property partnerships | (51,564) |  |  |  |  |  |  | (51,564)
Effective portion of interest rate contracts | (47,144) |  |  |  |  |  | (41,502) | (5,642)
Amortization of interest rate contracts | 3,751 |  |  |  |  |  | 3,365 | 386
Reallocation of noncontrolling interest | 0 |  |  | 15,374 |  |  |  | (15,374)
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 | 153,790,175 | 153,790,000 |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Redemption of operating partnership units to common stock |  | 495,000 |  |  |  |  |  |
Redemption of operating partnership units to common stock | $ 0 | $ 5 |  | 16,911 |  |  |  | (16,916)
Allocated net income for the year | 562,481 |  |  |  | 462,439 |  |  | 100,042
Dividends/distributions declared | (535,310) |  |  |  | (480,816) |  |  | (54,494)
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 | 37,292 |  |  | 3,899 |  |  |  | 33,393
Cumulative effect of a change in accounting principle | (2,035) |  |  |  | (272) |  |  | (1,763)
Contributions from noncontrolling interests in property partnerships | 161,585 |  |  |  |  |  |  | 161,585
Distributions to noncontrolling interests in property partnerships | (54,176) |  |  |  |  |  |  | (54,176)
Effective portion of interest rate contracts | (6,133) |  |  |  |  |  | (3,305) | (2,828)
Amortization of interest rate contracts | 6,033 |  |  |  |  |  | 5,127 | 906
Reallocation of noncontrolling interest | 0 |  |  | 22,879 |  |  |  | (22,879)
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 |  |  |  |  |  |

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