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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 - Common units [Member] | Noncontrolling interest - property partnerships [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Equity, value at Dec. 31, 2017 | $ 8,102,456 | $ 1,543 | $ 200,000 | $ 6,377,908 | $ (712,343) | $ (2,722) | $ (50,429) | $ 604,739 | $ 1,683,760
Equity, shares at Dec. 31, 2017 |  | 154,325,000 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle | 5,496 |  |  |  | 4,933 |  |  | 563 |
Conversion of operating partnership units to Common Stock, shares |  | 24,000 |  |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, value | 0 | $ 1 |  | 831 |  |  |  | (832) |
Allocated net income for the year | 216,312 |  |  |  | 178,646 |  |  | 20,432 | 17,234
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 |
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 | 155 | 144
Reallocation of noncontrolling interest | 0 |  |  | 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) | 619,347 | 1,685,715
Equity, shares at Mar. 31, 2018 |  | 154,362,000 |  |  |  |  |  |  |
Equity, value at Dec. 31, 2018 | $ 8,213,968 | $ 1,545 | 200,000 | 6,407,623 | (675,534) | (2,722) | (47,741) | 619,352 | 1,711,445
Equity, shares at Dec. 31, 2018 | 154,458,478 | 154,458,000 |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Cumulative effect of a change in accounting principle | $ (4,379) |  |  |  | (3,864) |  |  | (445) | (70)
Conversion of operating partnership units to Common Stock, shares |  | 14,000 |  |  |  |  |  |  |
Conversion of operating partnership units to Common Stock, value | 0 |  |  | 492 |  |  |  | (492) |
Allocated net income for the year | 131,159 |  |  |  | 100,730 |  |  | 11,599 | 18,830
Dividends/distributions declared | (166,600) |  |  |  | (149,415) |  |  | (17,185) |
Shares issued pursuant to stock purchase plan, shares |  | 4,000 |  |  |  |  |  |  |
Shares issued pursuant to stock purchase plan, value | 373 |  |  | 373 |  |  |  |  |
Net activity from stock option and incentive plan, shares |  | 39,000 |  |  |  |  |  |  |
Net activity from stock option and incentive plan, value | 16,469 |  |  | 3,059 |  |  |  | 13,410 |
Contributions from noncontrolling interests in property partnerships | 4,387 |  |  |  |  |  |  |  | 4,387
Distributions to noncontrolling interests in property partnerships | (24,128) |  |  |  |  |  |  |  | (24,128)
Effective portion of interest rate contracts | (2,628) |  |  |  |  |  | (2,359) | (269) |
Amortization of interest rate contracts | 1,666 |  |  |  |  |  | 1,366 | 156 | 144
Reallocation of noncontrolling interest | 0 |  |  | 3,065 |  |  |  | (3,065) |
Equity, value at Mar. 31, 2019 | $ 8,170,287 | $ 1,545 | $ 200,000 | $ 6,414,612 | $ (728,083) | $ (2,722) | $ (48,734) | $ 623,061 | $ 1,710,608
Equity, shares at Mar. 31, 2019 | 154,515,486 | 154,515,000 |  |  |  |  |  |  |

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