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Consolidated Statement of Changes in Equity - USD ($) $ in Thousands | Total | Parent Company [Member] | Partnership Interest [Member] | Preferred Stock [Member] Parent Company [Member] | Common Stock [Member] Parent Company [Member] | Treasury Stock [Member] Parent Company [Member] | Additional Paid-in Capital [Member] Parent Company [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Other Comprehensive Income (Loss) [Member] Parent Company [Member] | Distributions in Excess of Net Income [Member] Parent Company [Member] | Total Stockholders' Equity [Member] Parent Company [Member] | Noncontrolling Interest Exchangeable Operating Partnership Units [Member] Parent Company [Member] | Noncontrolling Interests in Limited Partners' Interest in Consolidated Partnerships [Member] Parent Company [Member] | Total Noncontrolling Interests [Member] Parent Company [Member] | Noncontrolling Interest [Member] Parent Company [Member] | Common Stock [Member] Parent Company [Member] | Common Stock [Member] Preferred Stock [Member] Parent Company [Member] | Common Stock [Member] Common Stock [Member] Parent Company [Member] | Common Stock [Member] Treasury Stock [Member] Parent Company [Member] | Common Stock [Member] Additional Paid-in Capital [Member] Parent Company [Member] | Common Stock [Member] Accumulated Other Comprehensive Income (Loss) [Member] Parent Company [Member] | Common Stock [Member] Distributions in Excess of Net Income [Member] Parent Company [Member] | Common Stock [Member] Total Stockholders' Equity [Member] Parent Company [Member] | Common Stock [Member] Noncontrolling Interest Exchangeable Operating Partnership Units [Member] Parent Company [Member] | Common Stock [Member] Noncontrolling Interests in Limited Partners' Interest in Consolidated Partnerships [Member] Parent Company [Member] | Common Stock [Member] Noncontrolling Interest [Member] Parent Company [Member] | Noncontrolling Interest [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Limited Partner [Member] | General Partner [Member]
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Beginning balance at Dec. 31, 2015 | $ 2,082,620 | $ 2,082,620 |  | $ 325,000 | $ 972 | $ (19,658) | $ 2,742,508 |  | $ (58,693) | $ (936,020) | $ 2,054,109 | $ (1,975) | $ 30,486 |  | $ 28,511 |  |  |  |  |  |  |  |  |  |  |  | $ 30,486 | $ (58,693) | $ (1,975) | $ 2,112,802
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 53,577 | 53,577 | $ 53,577 | 0 | 0 | 0 | 0 |  | 0 |  | 53,143 | 85 | 349 |  | 434 |  |  |  |  |  |  |  |  |  |  |  | 349 | 0 | 85 | 53,143
Net Income (Loss) Attributable to Parent |  | 53,143 | 53,228 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period other comprehensive income, net | (14,368) | (14,368) | (14,368) | 0 | 0 | 0 | 0 | $ (14,200) | (14,200) | 0 | (14,200) | (22) | (146) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14,200) | (22) | 0
Other comprehensive income (loss) attributable to noncontrolling interests |  | (168) | (146) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (146) |  |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Other Long-term Incentive Plans, Requisite Service Period Recognition |  | 0 |  | 0 | 0 | 1,287 | (1,287) |  | 0 | 0 | 0 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued, net of amortization | 3,402 | 3,402 |  | 0 | 2 | 0 | 3,400 |  | 0 | 0 | 3,402 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 3,402
Common stock redeemed for taxes withheld for stock based compensation, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,950 | $ 0 | $ 0 | $ 0 | $ 7,950 | $ 0 | $ 0 | $ 7,950 | $ 0 | $ 0 | $ 0 |  |  |  |
Common stock issued under dividend reinvestment plan |  | 292 | 292 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 292 | 0 | 0 | 292 | 0 | 0 | 0 |  |  |  |
Common stock issued, net of issuance costs |  | 12,293 |  | 0 | 2 | 0 | 12,291 |  | 0 | 0 | 12,293 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions from partners | 8,389 | 8,389 |  | 0 | 0 | 0 | 0 |  | 0 | 0 | 0 | 0 | 8,389 |  | 8,389 |  |  |  |  |  |  |  |  |  |  |  | 8,389 | 0 | 0 | 0
Distributions to partners | (50,616) | (1,737) |  | 0 | 0 | 0 | (350) |  | 0 | 0 | (350) | 0 | (1,387) |  | (1,387) |  |  |  |  |  |  |  |  |  |  |  | (1,387) | 0 | (77) | 49,152
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances | (4,635) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (4,635)
Cash dividends declared: preferred stock/unit | 5,266 | 5,266 |  | 0 | 0 | 0 | 0 |  | 0 | 5,266 | 5,266 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 5,266
Preferred stock |  | (5,266) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared - common stock/unit |  | 48,879 |  | 0 | 0 | 0 | 0 |  | 0 | 48,802 | 48,802 | 77 | 0 |  | 77 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2016 | 2,082,373 | 2,082,373 |  | 325,000 | 976 | (18,371) | 2,748,904 |  | (72,893) | (936,945) | 2,046,671 | (1,989) | 37,691 |  | 35,702 |  |  |  |  |  |  |  |  |  |  |  | 37,691 | (72,893) | (1,989) | 2,119,564
Beginning balance at Dec. 31, 2016 | 2,624,502 | 2,624,502 |  | 325,000 | 1,045 | (17,062) | 3,294,923 |  | (18,346) | (994,259) | 2,591,301 | (1,967) | 35,168 |  | 33,201 |  |  |  |  |  |  |  |  |  |  |  | 35,168 | (18,346) | (1,967) | 2,609,647
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | (20,715) | (20,715) | (20,715) | 0 | 0 | 0 | 0 |  | 0 |  | (21,367) | (19) | 671 |  | 652 |  |  |  |  |  |  |  |  |  |  |  | 671 | 0 | (19) | (21,367)
Net Income (Loss) Attributable to Parent |  | (21,367) | (21,386) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period other comprehensive income, net | 2,620 | 2,618 | 2,618 | 0 | 0 | 0 | 0 | $ 2,554 | 2,555 | 0 | 2,555 | 2 | 63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,555 | 2 | 0
Other comprehensive income (loss) attributable to noncontrolling interests |  | 65 | 63 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 63 |  |  |
Other Comprehensive Income, Net of Tax |  | 2,620 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Other Long-term Incentive Plans, Requisite Service Period Recognition |  | 1 |  | 0 | 0 | (411) | 412 |  | 0 | 0 | 1 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued, net of amortization | 3,733 | 3,733 |  | 0 | 2 | 0 | 3,731 |  | 0 | 0 | 3,733 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 3,733
Common stock redeemed for taxes withheld for stock based compensation, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,220 | 0 | 1 | 0 | 18,219 | 0 | 0 | 18,220 | 0 | 0 | 0 |  |  |  |
Common stock issued under dividend reinvestment plan |  | 301 | $ 301 |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 301 | 0 | 0 | 301 | 0 | 0 | 0 |  |  |  |
Common stock issued, net of issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,479,686 | $ 0 | $ 655 | $ 0 | $ 4,479,031 | $ 0 | $ 0 | $ 4,479,686 | $ 0 | $ 0 | $ 0 |  |  |  |
Contributions from partners | 153 | 153 |  | 0 | 0 | 0 | 0 |  | 0 | 0 | 0 | 0 | 153 |  | 153 |  |  |  |  |  |  |  |  |  |  |  | 153 | 0 | 0 | 0
Distributions to partners | (54,317) | (838) |  | 0 | 0 | 0 | 0 |  | 0 | 0 | 0 | 0 | (838) |  | (838) |  |  |  |  |  |  |  |  |  |  |  | (838) | 0 | (79) | (53,400)
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances | (4,461,767) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | (4,461,767)
Cash dividends declared: preferred stock/unit | 3,241 | 3,241 |  | 0 | 0 | 0 | 0 |  | 0 |  | 3,241 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 3,241
Redemption of preferred stock |  | 250,000 |  | 250,000 | 0 | 0 | (8,615) |  | 0 | 8,615 | 250,000 | 0 | 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock |  | (11,856) |  |  |  |  |  |  |  | (3,241) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared - common stock/unit |  | 53,479 |  | 0 | 0 | 0 | 0 |  | 0 | 53,400 | 53,400 | 79 | 0 |  | 79 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2017 | $ 6,764,503 | $ 6,764,503 |  | $ 75,000 | $ 1,701 | $ (17,473) | $ 7,768,794 |  | $ (15,791) | $ (1,080,882) | $ 6,731,349 | $ (2,063) | $ 35,217 |  | $ 33,154 |  |  |  |  |  |  |  |  |  |  |  | $ 35,217 | $ (15,791) | $ (2,063) | $ 6,747,139

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