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Consolidated Statement of Changes in Equity - USD ($) shares in Thousands, $ in Thousands | 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] | Accumulated Other Comprehensive Income (Loss) [Member] Partnership Interest [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] | Noncontrolling Interests in Limited Partners' Interest in Consolidated Partnerships [Member] Partnership Interest [Member] | Total Noncontrolling Interests [Member] Parent Company [Member] | General Partner Preferred and Common Units [Member] Partnership Interest [Member] | Limited Partners [Member] Partnership Interest [Member] | Total Partners' Capital [Member] Partnership Interest [Member] | Preferred Units [Member] Accumulated Other Comprehensive Income (Loss) [Member] Partnership Interest [Member] | Preferred Units [Member] Noncontrolling Interests in Limited Partners' Interest in Consolidated Partnerships [Member] Partnership Interest [Member] | Preferred Units [Member] General Partner Preferred and Common Units [Member] Partnership Interest [Member] | Preferred Units [Member] Limited Partners [Member] Partnership Interest [Member] | Preferred Units [Member] Total Partners' Capital [Member] Partnership Interest [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] Total Noncontrolling Interests [Member] Parent Company [Member]
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Beginning balance at Dec. 31, 2014 | $ 1,936,482 | $ 1,936,482 | $ 325,000 | $ 941 | $ (19,382) | $ 2,540,153 |  | $ (57,748) | $ (57,748) | $ (882,372) | $ 1,906,592 | $ (1,914) | $ 31,804 | $ 31,804 | $ 29,890 | $ 1,964,340 | $ (1,914) | $ 1,904,678 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 69,271 | 69,271 | 0 | 0 | 0 | 0 |  | 0 | 0 |  | 68,184 | 110 | 977 | 977 | 1,087 | 68,184 | 110 | 68,294 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 68,184 | 68,294 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period other comprehensive income, net | 8,964 | 8,964 | 0 | 0 | 0 | 0 | $ 8,949 | 8,949 | 8,949 | 0 | 8,949 | 15 | 0 |  |  | 0 | 15 | 8,964 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive (loss) income attributable to noncontrolling interests | 15 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Other Long-term Incentive Plans, Requisite Service Period Recognition | 0 |  | 0 | 0 | (8) | 8 |  | 0 |  | 0 | 0 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued, net of amortization | 7,004 | 7,004 | 0 | 3 | 0 | 7,001 |  | 0 | 0 | 0 | 7,004 | 0 | 0 | 0 | 0 | 7,004 | 0 | 7,004 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock redeemed for taxes withheld for stock based compensation, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,793 | $ 0 | $ 1 | $ 0 | $ 9,792 | $ 0 | $ 0 | $ 9,793 | $ 0 | $ 0 | $ 0
Common stock issued for dividend reinvestment plan | 683 | 683 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 683 | 0 | 0 | 683 | 0 | 0 | 0
Common stock issued for stock offerings, net of issuance costs |  |  | 0 | 0 | 0 | 955 |  | 0 |  | 0 | 955 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions from partners | 256 | 256 | 0 | 0 | 0 | 0 |  | 0 | 0 | 0 | 0 | 0 | 256 | 256 | 256 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to partners | (1,965) | (93,424) | 0 | 0 | 0 | 0 |  | 0 | 0 | 0 | 0 | 0 | (1,965) | (1,965) | (1,965) | (91,308) | (151) | (91,459) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared: preferred stock/unit | 10,531 | 10,531 | 0 | 0 | 0 | 0 |  | 0 |  | 10,531 | 10,531 | 0 | 0 |  | 0 |  |  |  | $ 0 | $ 0 | $ 10,531 | $ 0 | $ 10,531 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Dividends, Income Statement Impact | 10,531 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared - common stock/unit | 91,459 |  | 0 | 0 | 0 | 0 |  | 0 |  | 91,308 | 91,308 | 151 | 0 |  | 151 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Jun. 30, 2015 | 1,909,867 | $ 1,909,867 | 325,000 | 943 | (19,390) | 2,539,008 |  | (48,799) | $ (48,799) | (916,027) | 1,880,735 | (1,940) | 31,072 | $ 31,072 | 29,132 | $ 1,929,534 | $ (1,940) | $ 1,878,795 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units, Redeemed |  | 8,155 |  |  |  |  |  |  | 0 |  |  |  |  | 0 |  | 8,155 | 0 | 8,155 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2015 | 2,082,620 | $ 2,082,620 | 325,000 | 972 | (19,658) | 2,742,508 |  | (58,693) | $ (58,693) | (936,020) | 2,054,109 | (1,975) | 30,486 | $ 30,486 | 28,511 | $ 2,112,802 | $ (1,975) | $ 2,052,134 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 94,221 | 94,221 | 0 | 0 | 0 | 0 |  | 0 | 0 |  | 93,218 | 150 | 853 | 853 | 1,003 | 93,218 | 150 | 93,368 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent | 93,218 | 93,368 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period other comprehensive income, net | (21,642) | (21,642) | 0 | 0 | 0 | 0 | $ (21,345) | (21,345) | (21,345) | 0 | (21,345) | (34) | (263) |  |  | 0 | (34) | (21,379) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive (loss) income attributable to noncontrolling interests | (297) | (263) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Other Long-term Incentive Plans, Requisite Service Period Recognition | 0 |  | 0 | 0 | 2,815 | (2,815) |  | 0 |  | 0 | 0 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued, net of amortization | 6,804 | 6,804 | 0 | 2 | 0 | 6,802 |  | 0 | 0 | 0 | 6,804 | 0 | 0 | 0 | 0 | 6,804 | 0 | 6,804 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock redeemed for taxes withheld for stock based compensation, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,876 | 0 | 0 | 0 | 7,876 | 0 | 0 | 7,876 | 0 | 0 | 0
Common stock issued for dividend reinvestment plan | 547 | 547 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 547 | 0 | 0 | 547 | 0 | 0 | 0
Common stock issued for stock offerings, net of issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 149,788 | $ 0 | $ 21 | $ 0 | $ 149,767 | $ 0 | $ 0 | $ 149,788 | $ 0 | $ 0 | $ 0
Contributions from partners | 8,600 | 8,600 | 0 | 0 | 0 | 0 |  | 0 | 0 | 0 | 0 | 0 | 8,600 | 8,600 | 8,600 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to partners | (2,744) | (100,506) | 0 | 0 | 0 | (350) |  | 0 | 0 | 0 | (350) | 0 | (2,394) | (2,394) | (2,394) | 97,958 | (154) | (98,112) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances |  | 142,459 |  |  |  |  |  |  | 0 |  |  |  |  | 0 |  | 142,459 | 0 | 142,459 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared: preferred stock/unit | 10,531 | 10,531 | 0 | 0 | 0 | 0 |  | 0 |  |  | 10,531 | 0 | 0 |  | 0 |  |  |  | $ 0 | $ 0 | $ 10,531 | $ 0 | $ 10,531 |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Dividends, Income Statement Impact | 10,531 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared - common stock/unit | 97,762 |  | 0 | 0 | 0 | 0 |  | 0 |  | 97,608 | 97,608 | 154 | 0 |  | 154 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Jun. 30, 2016 | $ 2,202,025 | $ 2,202,025 | $ 325,000 | $ 995 | $ (16,843) | $ 2,888,583 |  | $ (80,038) | $ (80,038) | $ (950,941) | $ 2,166,756 | $ (2,013) | $ 37,282 | $ 37,282 | $ 35,269 | $ 2,246,794 | $ (2,013) | $ 2,164,743 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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