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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Noncontrolling Interest (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ 589,548 |  |  |  |  | $ 589,548 |  |
Net income (loss) | $ 24,944 | $ 13,285 | $ 6,108 | $ 19,971 | $ 34,236 | $ 326 | $ 26,155 | $ 73,875 | 64,308 | $ 134,592 | $ 149,970
Conversion of Common OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  |  |  |  |  |  | 0 | 0 | 0
Issuance of OP Units to acquire real estate |  |  |  |  |  |  |  |  |  | 31,429 |
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  |  | (18,379) | (7,970)
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  |  |  |  |  |  | 634 | (646) | (5,061)
Change in control of previously unconsolidated investment |  |  |  |  |  |  |  |  |  | (75,713) |
Reclassification of realized interest on swap agreements |  |  |  |  |  |  |  |  | 3,317 | 4,576 | 5,524
Noncontrolling interest contributions |  |  |  |  |  |  |  |  | 85,206 | 295,108 | 35,489
Noncontrolling interest distributions |  |  |  |  |  |  |  |  | (32,805) | (80,769) | (74,950)
Employee Long-term Incentive Plan Unit Awards |  |  |  |  |  |  |  |  | 11,155 | 13,694 | 8,644
Rebalancing adjustment |  |  |  |  |  |  |  |  | 0 | 0 |
Balance | $ 648,440 |  |  |  | $ 589,548 |  |  |  | 648,440 | 589,548 |
Payments to noncontrolling interests |  |  |  |  |  |  |  |  | $ 39,942 | $ 105,994 | $ 84,610
Distributions declared (in dollars per share) | $ 0.27 | $ 0.26 | $ 0.26 | $ 0.26 | $ 0.41 | $ 0.25 | $ 0.25 | $ 0.25 | $ 1.05 | $ 1.16 | $ 1.22
Preferred shares converted to common stock (in shares) | 5,000 |  |  |  |  |  |  |  | 5,000 |  |
Limited partners' capital account, units issued and converted (in shares) | 81,453 |  |  |  | 351,250 |  |  |  | 81,453 | 351,250 |
Fund II |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Additional ownership interest acquired |  |  |  |  |  |  |  | 8.30% |  |  |
Payments to noncontrolling interests |  |  |  |  |  |  |  | $ 18,400 |  |  |
Equity Interest Held By Operating Partnership |  |  |  |  |  |  |  | 28.33% |  |  |
LTIP Units |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
LTIP units outstanding (in shares) | 2,274,147 |  |  |  | 1,997,099 |  |  |  | 2,274,147 | 1,997,099 |
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Limited partners' capital account, units issued and converted (in shares) | 1,392 |  |  |  |  |  |  |  | 1,392 |  |
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ (35,700) |  |  |  | $ (31,800) | $ (35,700) | $ (31,800) |
Net income (loss) |  |  |  |  | $ (4,200) |  |  |  |  | (4,200) |
Balance |  |  |  |  | $ (35,700) |  |  |  |  | $ (35,700) | $ (31,800)
Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Series A Preferred OP Units (in shares) | 3,328,873 |  |  |  | 3,308,875 |  |  |  | 3,328,873 | 3,308,875 |
Equity Interest Held By Operating Partnership |  |  |  |  |  |  |  |  | 95.00% | 95.00% |
Operating Partnership, as General Partner or Managing Member | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Series A Preferred OP Units (in shares) | 188 |  |  |  | 188 |  |  |  | 188 | 188 |
Operating Partnership, as General Partner or Managing Member | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Series A Preferred OP Units (in shares) | 136,593 |  |  |  | 141,593 |  |  |  | 136,593 | 141,593 |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 589,548 |  |  |  | 420,866 | $ 589,548 | $ 420,866 |
Distributions declared of $0.78 and $1.16 per Common OP Unit for Years Ended 2017 and 2016, respectively |  |  |  |  |  |  |  |  | (6,453) | (6,753) |
Net income (loss) |  |  |  |  |  |  |  |  | 2,838 | 61,816 |
Conversion of Common OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  |  |  |  |  |  | (1,541) | (7,892) | (2,451)
Issuance of OP Units to acquire real estate |  |  |  |  |  |  |  |  |  | 31,429 |
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  |  | (25,925) | (3,561)
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  |  |  |  |  |  | (147) | (332) |
Change in control of previously unconsolidated investment |  |  |  |  |  |  |  |  |  | (75,713) |
Reclassification of realized interest on swap agreements |  |  |  |  |  |  |  |  | 686 | 597 |
Noncontrolling interest contributions |  |  |  |  |  |  |  |  | 85,206 | 295,108 | 35,489
Noncontrolling interest distributions |  |  |  |  |  |  |  |  | (32,805) | (80,769) | (74,950)
Employee Long-term Incentive Plan Unit Awards |  |  |  |  |  |  |  |  | 10,457 | 12,768 | 6,723
Rebalancing adjustment |  |  |  |  |  |  |  |  | 651 | (35,652) |
Balance | $ 648,440 |  |  |  | $ 589,548 |  |  |  | 648,440 | 589,548 | 420,866
Noncontrolling Interests | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance | 651 |  |  |  |  |  |  |  | 651 |  |
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 494,126 |  |  |  | 324,526 | 494,126 | 324,526 |
Distributions declared of $0.78 and $1.16 per Common OP Unit for Years Ended 2017 and 2016, respectively |  |  |  |  |  |  |  |  | 0 | 0 |
Net income (loss) |  |  |  |  |  |  |  |  | (1,321) | 56,814 |
Conversion of Common OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  |  |  |  |  |  | 0 | 0 |
Issuance of OP Units to acquire real estate |  |  |  |  |  |  |  |  |  | 0 |
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  |  | (25,925) |
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  |  |  |  |  |  | (232) | (289) |
Change in control of previously unconsolidated investment |  |  |  |  |  |  |  |  |  | (75,713) |
Reclassification of realized interest on swap agreements |  |  |  |  |  |  |  |  | 545 | 374 |
Noncontrolling interest contributions |  |  |  |  |  |  |  |  | 85,206 | 295,108 |
Noncontrolling interest distributions |  |  |  |  |  |  |  |  | (32,805) | (80,769) |
Employee Long-term Incentive Plan Unit Awards |  |  |  |  |  |  |  |  | 0 | 0 |
Rebalancing adjustment |  |  |  |  |  |  |  |  |  | 0 |
Balance | 545,519 |  |  |  | 494,126 |  |  |  | 545,519 | 494,126 | 324,526
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance | 0 |  |  |  |  |  |  |  | 0 |  |
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ 95,422 |  |  |  | $ 96,340 | 95,422 | 96,340 |
Distributions declared of $0.78 and $1.16 per Common OP Unit for Years Ended 2017 and 2016, respectively |  |  |  |  |  |  |  |  | (6,453) | (6,753) |
Net income (loss) |  |  |  |  |  |  |  |  | 4,159 | 5,002 |
Conversion of Common OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  |  |  |  |  |  | (1,541) | (7,892) |
Issuance of OP Units to acquire real estate |  |  |  |  |  |  |  |  |  | 31,429 |
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 |
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  |  |  |  |  |  | 85 | (43) |
Change in control of previously unconsolidated investment |  |  |  |  |  |  |  |  |  | 0 |
Reclassification of realized interest on swap agreements |  |  |  |  |  |  |  |  | 141 | 223 |
Noncontrolling interest contributions |  |  |  |  |  |  |  |  | 0 | 0 |
Noncontrolling interest distributions |  |  |  |  |  |  |  |  | 0 | 0 |
Employee Long-term Incentive Plan Unit Awards |  |  |  |  |  |  |  |  | 10,457 | 12,768 |
Rebalancing adjustment |  |  |  |  |  |  |  |  |  | (35,652) |
Balance | 102,921 |  |  |  | $ 95,422 |  |  |  | 102,921 | $ 95,422 | $ 96,340
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance | $ 651 |  |  |  |  |  |  |  | $ 651 |  |

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