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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 |  | 23,000 |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, value | 0 | $ 0 |  | 793 |  |  |  | (793)
Allocated net income for the year | 115,564 |  |  |  | 99,708 |  |  | 15,856
Dividends/distributions declared | (131,665) |  |  |  | (118,012) |  |  | (13,653)
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 |  | 33,000 |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 12,281 | $ 0 |  | 996 |  |  |  | 11,285
Cumulative effect of a change in accounting principle | (2,035) |  |  |  | (272) |  |  | (1,763)
Contributions from noncontrolling interests in property partnerships | 8,145 |  |  |  |  |  |  | 8,145
Distributions to noncontrolling interests in property partnerships | (13,635) |  |  |  |  |  |  | (13,635)
Effective portion of interest rate contracts | 180 |  |  |  |  |  | 97 | 83
Amortization of interest rate contracts | 1,306 |  |  |  |  |  | 1,171 | 135
Reallocation of noncontrolling interest | 0 |  |  | 4,384 |  |  |  | (4,384)
Equity, value at Mar. 31, 2017 | 7,922,438 | $ 1,538 | 200,000 | 6,339,970 | (712,270) | (2,722) | (50,983) | 2,146,905
Equity, shares at Mar. 31, 2017 |  | 153,849,000 |  |  |  |  |  |
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 |  | 24,000 |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, value |  | $ 1 |  | 831 |  |  |  | (832)
Allocated net income for the year | $ 216,312 |  |  |  | 178,646 |  |  | 37,666
Dividends/distributions declared | (140,466) |  |  |  | (126,115) |  |  | (14,351)
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 |  | 10,000 |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 13,620 |  |  | (185) |  |  |  | 13,805
Cumulative effect of a change in accounting principle | 5,496 |  |  |  | 4,933 |  |  | 563
Contributions from noncontrolling interests in property partnerships | 15,267 |  |  |  |  |  |  | 15,267
Distributions to noncontrolling interests in property partnerships | (30,690) |  |  |  |  |  |  | (30,690)
Amortization of interest rate contracts | 1,666 |  |  |  |  |  | 1,367 | 299
Reallocation of noncontrolling interest |  |  |  | 5,164 |  |  |  | (5,164)
Equity, value at Mar. 31, 2018 | $ 8,184,090 | $ 1,544 | $ 200,000 | $ 6,384,147 | $ (654,879) | $ (2,722) | $ (49,062) | $ 2,305,062
Equity, shares at Mar. 31, 2018 | 154,362,303 | 154,362,000 |  |  |  |  |  |

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