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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Income - Noncontrolling Interest (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | $ 648,440 |  |
Net income (loss) | $ (2,270) | $ 6,108 | (6,430) | $ 26,079 |
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership |  |  | 0 | 0 |
Other comprehensive income - unrealized gain on valuation of swap agreements | 2,950 | (2,124) | 8,603 | (2,008) |
Reclassification of realized interest on swap agreements | 109 | $ 930 | 472 | 1,903 |
Noncontrolling interest contributions |  |  | 6,550 | 20,505 |
Noncontrolling interest distributions |  |  | (15,640) | (4,507) |
Employee Long-term Incentive Plan Unit Awards |  |  | 6,113 | 7,002 |
Rebalancing adjustment |  |  | 0 | $ 0 |
Ending Balance | $ 619,874 |  | $ 619,874 |  |
Distributions declared (in dollars per share) |  |  | $ 0.54 | $ 0.52 |
Conversion of Common OP Units to Common Shares by limited partners of the Operating Partnership (in shares) | 63,931 | 41,166 | 63,931 | 41,166 |
LTIP Units |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
LTIP units outstanding (in shares) | 2,606,221 |  | 2,606,221 |  | 2,274,147
Operating Partnership, as General Partner or Managing Member |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Series A Preferred OP Units (in shares) | 3,331,440 |  | 3,331,440 |  | 3,328,873
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
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 |  | 136,593 |  | 136,593
Noncontrolling Interests |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | $ 648,440 | $ 589,548 |
Distributions declared of $0.54 and $0.52 per Common OP Unit for six months ended June 30, 2018 and 2017, respectively |  |  | (3,434) | (3,207) |
Net income (loss) |  |  | (21,514) | (1,612) |
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership |  |  | (1,123) | (730) |
Other comprehensive income - unrealized gain on valuation of swap agreements |  |  | 1,358 | (747) |
Reclassification of realized interest on swap agreements |  |  | 193 | 364 |
Noncontrolling interest contributions |  |  | 6,550 | 20,505 |
Noncontrolling interest distributions |  |  | (15,640) | (4,507) |
Employee Long-term Incentive Plan Unit Awards |  |  | 5,842 | 6,662 |
Rebalancing adjustment |  |  | (798) | 3,927 |
Ending Balance | $ 619,874 | $ 610,203 | 619,874 | 610,203 |
Noncontrolling Interests | Restatement Adjustment |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Ending Balance | (798) |  | (798) |  |
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | 545,519 | 494,126 |
Distributions declared of $0.54 and $0.52 per Common OP Unit for six months ended June 30, 2018 and 2017, respectively |  |  | 0 | 0 |
Net income (loss) |  |  | (22,759) | (3,532) |
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership |  |  | 0 | 0 |
Other comprehensive income - unrealized gain on valuation of swap agreements |  |  | 930 | (676) |
Reclassification of realized interest on swap agreements |  |  | 174 | 277 |
Noncontrolling interest contributions |  |  | 6,550 | 20,505 |
Noncontrolling interest distributions |  |  | (15,640) | (4,507) |
Employee Long-term Incentive Plan Unit Awards |  |  | 0 | 0 |
Rebalancing adjustment |  |  |  | 0 |
Ending Balance | 514,774 | 506,193 | 514,774 | 506,193 |
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates | Restatement Adjustment |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Ending Balance | 0 |  | 0 |  |
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  |  | 102,921 | 95,422 |
Distributions declared of $0.54 and $0.52 per Common OP Unit for six months ended June 30, 2018 and 2017, respectively |  |  | (3,434) | (3,207) |
Net income (loss) |  |  | 1,245 | 1,920 |
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership |  |  | (1,123) | (730) |
Other comprehensive income - unrealized gain on valuation of swap agreements |  |  | 428 | (71) |
Reclassification of realized interest on swap agreements |  |  | 19 | 87 |
Noncontrolling interest contributions |  |  | 0 | 0 |
Noncontrolling interest distributions |  |  | 0 | 0 |
Employee Long-term Incentive Plan Unit Awards |  |  | 5,842 | 6,662 |
Rebalancing adjustment |  |  |  | 3,927 |
Ending Balance | 105,100 | $ 104,010 | 105,100 | $ 104,010 |
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member | Restatement Adjustment |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Ending Balance | $ (798) |  | $ (798) |  |

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