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Consolidated Statement of Changes in Equity - USD ($) $ in Thousands | Total | Parent Company [Member] | Partnership Interest [Member] | Preferred Stock Parent Company [Member] | Common Stock Parent Company [Member] | Treasury Stock Parent Company [Member] | Partners Capital Total [Member] | Distributions in Excess of Net Income 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 Interest [Member] Parent Company [Member] | Additional Paid-in Capital [Member] Parent Company [Member] | AOCI Attributable to Parent [Member] | AOCI Attributable to Parent [Member] Parent Company [Member] | Common Stock Parent Company [Member] | Common Stock Preferred Stock Parent Company [Member] | Common Stock Common Stock Parent Company [Member] | Common Stock Treasury Stock Parent Company [Member] | Common Stock Distributions in Excess of Net Income Parent Company [Member] | Common Stock Total Stockholders' Equity [Member] Parent Company [Member] | Common Stock Noncontrolling Interest Exchangeable Operating Partnership Units [Member] Parent Company [Member] | Common Stock Noncontrolling Interests in Limited Partners Interest in Consolidated Partnerships [Member] Parent Company [Member] | Common Stock Noncontrolling Interest [Member] Parent Company [Member] | Common Stock Additional Paid-in Capital [Member] Parent Company [Member] | Common Stock AOCI Attributable to Parent [Member] Parent Company [Member] | Limited Partner [Member] | General Partner Preferred and Common Units | AOCI Attributable to Parent [Member] | Partners Capital Total [Member] | Noncontrolling Interest [Member]
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Common stock/unit per share | $ 1.88 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from common stock issuance |  | $ 102,453 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 102,453 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2013 | $ (1,861,134) | (1,861,134) |  | $ (325,000) | $ (923) | $ 16,726 |  | $ 874,916 | $ (1,843,354) | $ 1,426 | $ (19,206) | $ (17,780) | $ (2,426,477) |  | $ 17,404 |  |  |  |  |  |  |  |  |  |  |  | $ 1,426 | $ (1,860,758) | $ 17,404 | $ (1,841,928) | $ (19,206)
Other comprehensive (loss) income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 188,847 | 188,847 | $ 188,847 | 0 | 0 | 0 |  |  | 187,390 | 319 | 1,138 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 319 | 187,390 | 0 | 187,709 | 1,138
Net Income (Loss) Attributable to Noncontrolling Interest |  | 1,457 | 1,138 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  | 187,390 | 187,709 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  | (9,353) | (9,353) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period other comprehensive income, net | (40,615) | (40,615) | (40,615) | 0 | 0 | 0 |  | 0 | (40,344) | (70) | (201) |  | 0 | $ (40,344) | (40,344) |  |  |  |  |  |  |  |  |  |  |  | (70) | 0 | (40,344) | (40,414) |
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest |  | (271) | (201) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Other Long-term Incentive Plans, Requisite Service Period Recognition |  | 0 |  | 0 | 0 | (2,656) |  | 0 | 0 | 0 | 0 | 0 | 2,656 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued, net of amortization | 12,161 | 12,161 |  | 0 | 0 | 0 | $ 12,161 | 0 | 12,161 | 0 | 0 | 0 | 12,161 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 12,161 | 0 |  | 0
Adjustments Related to Tax Withholding for Share-based Compensation |  |  |  | 0 | 0 | 0 |  |  |  | 0 |  |  |  |  |  | 3,493 |  |  |  | $ 0 | $ 3,493 |  | $ 0 | $ 0 | $ 3,493 | $ 0 |  |  |  |  |
Stock Issued During Period, Value, Dividend Reinvestment Plan |  | 1,184 | 1,184 | 0 | 0 | 0 |  |  |  | 0 |  |  |  |  |  | 1,184 |  |  |  | 0 | 1,184 |  | 0 | 0 | 1,184 | 0 |  |  |  |  |
Common stock issued for stock offerings, net of issuance costs |  |  |  | 0 | (18) | 0 |  |  |  | 0 |  |  |  |  |  |  |  |  |  | 0 | (102,453) |  | 0 | 0 | (102,435) | 0 |  |  |  |  |
Common stock issued for partnership units exchanged |  | (137) | (137) |  |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 0 | $ 0 | $ 0 | 0 | (137) | $ (137) | 0 | (137) | (137) | 0 |  |  |  |  |
Partners' Capital Account, Redemptions | (300) | (300) |  | 0 | 0 | 0 |  | 0 | 0 | (300) | 0 | (300) | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | (300) | 0 | 0 | (300) | 0
Contributions from partners | 16,204 | 16,204 |  | 0 | 0 | 0 |  | 0 | 0 | 0 | 16,204 | 16,204 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 16,204
Partners' Capital Account, Distributions |  | 5,947 |  | 0 | 0 | 0 |  | 0 | 1,404 | 0 | 4,543 | 4,543 | 1,404 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions To Partners | (180,031) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (300) | (175,188) | 0 | (175,488) | (4,543)
Cash dividends declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock/unit | (21,062) | (21,062) |  | 0 | 0 | 0 | 21,062 | 21,062 | (21,062) | 0 | 0 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 21,062 | 0 |  | 0
Preferred stock dividends |  | (21,062) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock/unit |  | (174,084) |  | 0 | 0 | 0 |  | (173,784) | (173,784) | (300) | 0 | (300) | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2014 | (1,936,482) | (1,936,482) |  | (325,000) | (941) | 19,382 |  | 882,372 | (1,906,592) | 1,914 | (31,804) | (29,890) | (2,540,153) |  | 57,748 |  |  |  |  |  |  |  |  |  |  |  | 1,914 | (1,964,340) | 57,748 | (1,904,678) | (31,804)
Cash dividends declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common unit issued as a result of common stock issued by Parent Company, net of purchases | 100,144 |  |  |  |  |  | 100,144 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 100,144 | 0 |  | 0
Common units exchanged for common stock of the parent company | $ 0 |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 137 | (137) | 0 |  | 0
Common stock/unit per share | $ 1.94 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from common stock issuance |  | 198,494 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 152,543 | 152,543 | 152,543 | 0 | 0 | 0 |  |  | 150,056 | 240 | 2,247 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 240 | 150,056 | 0 | 150,296 | 2,247
Net Income (Loss) Attributable to Noncontrolling Interest |  | 2,487 | 2,247 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  | 150,056 | 150,296 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  | (9,152) | (9,152) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period other comprehensive income, net | (980) | (980) | (980) | 0 | 0 | 0 |  | 0 | (945) | (2) | (33) |  | 0 | (945) | (945) |  |  |  |  |  |  |  |  |  |  |  | (2) | 0 | (945) | (947) |
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest |  | (35) | (33) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Other Long-term Incentive Plans, Requisite Service Period Recognition |  | 0 |  | 0 | 0 | (276) |  | 0 | 0 | 0 | 0 | 0 | 276 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued, net of amortization | 13,869 | 13,869 |  | 0 | 0 | 0 | 13,869 | 0 | 13,869 | 0 | 0 | 0 | 13,869 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 13,869 | 0 |  | 0
Adjustments Related to Tax Withholding for Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,706 | 0 | 0 | 0 | 0 | 9,706 | 0 | 0 | 0 | 9,706 | 0 |  |  |  |  |
Stock Issued During Period, Value, Dividend Reinvestment Plan |  | 1,250 | 1,250 |  |  |  |  |  |  |  |  |  |  |  |  | 1,250 | 0 | 0 | 0 | 0 | 1,250 | 0 | 0 | 0 | 1,250 | 0 |  |  |  |  |
Common stock issued for stock offerings, net of issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (198,494) | 0 | (31) | 0 | 0 | (198,494) | 0 | 0 | 0 | (198,463) | 0 |  |  |  |  |
Common stock issued for partnership units exchanged |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions from partners | 717 | 717 |  | 0 | 0 | 0 |  | 0 | 0 | 0 | 717 | 717 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 717
Partners' Capital Account, Distributions |  | 6,046 |  | 0 | 0 | 0 |  | 0 | 1,797 | 0 | 4,249 | 4,249 | 1,797 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions To Partners | (188,987) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (299) | (184,439) | 0 | (184,738) | (4,249)
Preferred stock/unit | (21,062) | (21,062) |  | 0 | 0 | 0 | 21,062 | 21,062 | (21,062) | 0 | 0 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 21,062 | 0 |  | 0
Preferred stock dividends |  | (21,062) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock/unit |  | (182,941) |  | 0 | 0 | 0 |  | (182,642) | (182,642) | (299) | 0 | (299) | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2015 | (2,082,620) | (2,082,620) | (2,082,620) | (325,000) | (972) | 19,658 |  | 936,020 | (2,054,109) | 1,975 | (30,486) | (28,511) | (2,742,508) |  | 58,693 |  |  |  |  |  |  |  |  |  |  |  | 1,975 | (2,112,802) | 58,693 | (2,052,134) | (30,486)
Cash dividends declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common unit issued as a result of common stock issued by Parent Company, net of purchases | 190,038 |  |  |  |  |  | 190,038 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 190,038 | 0 |  | 0
Noncontrolling Interest, Decrease from Deconsolidation | $ 0 | 0 |  | 0 | 0 | 0 |  | 0 | (538) | 0 | 538 | 538 | (538) |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | (538) | 0 | (538) | 538
Common stock/unit per share | $ 2.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from common stock issuance |  | 548,920 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 166,992 | 166,992 | 166,992 | 0 | 0 | 0 |  |  | 164,922 | 257 | 1,813 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 257 | 164,922 | 0 | 165,179 | 1,813
Net Income (Loss) Attributable to Noncontrolling Interest |  | 2,070 | 1,813 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent |  | 164,922 | 165,179 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax |  | (51,139) | (51,139) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period other comprehensive income, net | 40,831 | 40,831 | 40,831 | 0 | 0 | 0 |  | 0 | 40,347 | 58 | 426 |  | 0 | $ 40,347 | 40,347 |  |  |  |  |  |  |  |  |  |  |  | 58 | 0 | 40,347 | 40,405 |
Other Comprehensive (Income) Loss, Net of Tax, Portion Attributable to Noncontrolling Interest |  | 484 | 426 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Share-based Compensation, Other Long-term Incentive Plans, Requisite Service Period Recognition |  | 0 |  | 0 | 0 | (2,596) |  | 0 | 0 | 0 | 0 | 0 | (2,596) |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock issued, net of amortization | 13,421 | 13,421 |  | 0 | 2 | 0 | 13,421 | 0 | 13,421 | 0 | 0 | 0 | 13,419 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 13,421 | 0 |  | 0
Adjustments Related to Tax Withholding for Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,789 | 0 | 0 | 0 | 0 | 7,789 | 0 | 0 | 0 | 7,789 | 0 |  |  |  |  |
Stock Issued During Period, Value, Dividend Reinvestment Plan |  | 1,070 | 1,070 |  |  |  |  |  |  |  |  |  |  |  |  | 1,070 | 0 | 0 | 0 | 0 | 1,070 | 0 | 0 | 0 | 1,070 | 0 |  |  |  |  |
Common stock issued for stock offerings, net of issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (548,920) | $ 0 | $ (71) | $ 0 | $ 0 | $ (548,920) | $ 0 | $ 0 | $ 0 | $ (548,849) | $ 0 |  |  |  |  |
Common stock issued for partnership units exchanged |  | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Redemptions | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 0
Contributions from partners | 8,760 | 8,760 |  | 0 | 0 | 0 |  | 0 | 0 | 0 | 8,760 | 8,760 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 8,760
Partners' Capital Account, Distributions |  | 6,855 |  | 0 | 0 | 0 |  | 0 | 0 | 0 | 6,855 | 6,855 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions To Partners | (209,261) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (307) | (202,099) | 0 | (202,406) | (6,855)
Preferred stock/unit | (21,062) | (21,062) |  | 0 | 0 | 0 | 21,062 |  | (21,062) | 0 | 0 | 0 | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 21,062 | 0 |  | 0
Preferred stock dividends |  | (21,062) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock/unit |  | (202,406) |  | 0 | 0 | 0 |  | (202,099) | (202,099) | (307) | 0 | (307) | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Dec. 31, 2016 | (2,624,502) | $ (2,624,502) | $ (2,624,502) | $ (325,000) | $ (1,045) | $ 17,062 |  | $ 994,259 | $ (2,591,301) | $ 1,967 | $ (35,168) | $ (33,201) | $ (3,294,923) |  | $ 18,346 |  |  |  |  |  |  |  |  |  |  |  | 1,967 | (2,609,647) | 18,346 | $ (2,589,334) | (35,168)
Cash dividends declared: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common unit issued as a result of common stock issued by Parent Company, net of purchases | $ 542,201 |  |  |  |  |  | $ 542,201 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 542,201 | $ 0 |  | $ 0

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