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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 | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance |  |  |  | $ 589,548 |  |
Net income (loss) | $ 6,108 | $ 26,155 |  | 26,079 | $ 100,030 |
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 |  |  |  |  | 29,336 |
Acquisition of noncontrolling interests |  |  |  |  | (18,379) |
Other comprehensive income - unrealized loss on valuation of swap agreements | (2,124) | (5,279) |  | (2,008) | (14,098) |
Change in control of previously unconsolidated investment |  |  |  |  | (75,713) |
Reclassification of realized interest on swap agreements | 930 | $ 1,140 |  | 1,903 | 2,186 |
Noncontrolling interest contributions |  |  |  | 20,505 | 157,409 |
Noncontrolling interest distributions |  |  |  | (4,507) | (49,135) |
Employee Long-term Incentive Plan Unit Awards |  |  |  | 7,002 | 6,076 |
Rebalancing adjustment |  |  |  | 0 | 0 |
Balance | $ 610,203 |  |  | 610,203 |  | $ 589,548
Payments to noncontrolling interests |  |  |  | $ 8,452 | $ 71,432 |
Distributions declared (in dollars per share) |  |  |  | $ 0.52 | $ 0.50 | $ 0.50
Limited partners' capital account, units issued and converted (in shares) | 41,166 |  |  | 41,166 |  | 303,536
LTIP Units |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
LTIP units outstanding (in shares) | 2,266,957 | 1,990,081 |  | 2,266,957 | 1,990,081 |
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 |  |
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% |  |  |
Operating Partnership, as General Partner or Managing Member |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Series A Preferred OP Units (in shares) | 3,361,397 | 3,317,760 |  | 3,361,397 | 3,317,760 |
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) | 140,343 | 141,593 |  | 140,343 | 141,593 |
Noncontrolling Interests |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance |  |  | $ 420,866 | $ 589,548 | $ 420,866 | $ 420,866
Distributions declared of $0.52 and $0.50 per Common OP Unit for Six Months Ended June 30, 2017 and 2016 |  |  |  | (3,207) | (2,932) |
Net income (loss) |  |  |  | (1,612) | 53,187 |
Conversion of Common OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  | (730) | (7,383) |
Issuance of OP Units to acquire real estate |  |  |  |  | 29,336 |
Acquisition of noncontrolling interests |  |  |  |  | (25,948) |
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  | (747) | (1,441) |
Change in control of previously unconsolidated investment |  |  |  |  | (75,713) |
Reclassification of realized interest on swap agreements |  |  |  | 364 | 286 |
Noncontrolling interest contributions |  |  |  | 20,505 | 157,409 |
Noncontrolling interest distributions |  |  |  | (4,507) | (49,135) |
Employee Long-term Incentive Plan Unit Awards |  |  |  | 6,662 | 5,602 |
Rebalancing adjustment |  |  |  | 3,927 | (38,845) |
Balance | $ 610,203 | $ 465,289 |  | 610,203 | 465,289 | 589,548
Noncontrolling Interests | Restatement Adjustment |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance | 3,927 |  |  | 3,927 |  |
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance |  |  | 324,526 | 494,126 | 324,526 | 324,526
Distributions declared of $0.52 and $0.50 per Common OP Unit for Six Months Ended June 30, 2017 and 2016 |  |  |  | 0 | 0 |
Net income (loss) |  |  |  | (3,532) | 49,940 |
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 |  |  |  |  | (25,948) |
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  | (676) | (729) |
Change in control of previously unconsolidated investment |  |  |  |  | (75,713) |
Reclassification of realized interest on swap agreements |  |  |  | 277 | 179 |
Noncontrolling interest contributions |  |  |  | 20,505 | 157,409 |
Noncontrolling interest distributions |  |  |  | (4,507) | (49,135) |
Employee Long-term Incentive Plan Unit Awards |  |  |  | 0 | 0 |
Rebalancing adjustment |  |  |  |  | 0 |
Balance | 506,193 | 380,529 |  | 506,193 | 380,529 | 494,126
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 |  |  | $ 96,340 | 95,422 | 96,340 | 96,340
Distributions declared of $0.52 and $0.50 per Common OP Unit for Six Months Ended June 30, 2017 and 2016 |  |  |  | (3,207) | (2,932) |
Net income (loss) |  |  |  | 1,920 | 3,247 |
Conversion of Common OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  | (730) | (7,383) |
Issuance of OP Units to acquire real estate |  |  |  |  | 29,336 |
Acquisition of noncontrolling interests |  |  |  |  | 0 |
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  | (71) | (712) |
Change in control of previously unconsolidated investment |  |  |  |  | 0 |
Reclassification of realized interest on swap agreements |  |  |  | 87 | 107 |
Noncontrolling interest contributions |  |  |  | 0 | 0 |
Noncontrolling interest distributions |  |  |  | 0 | 0 |
Employee Long-term Incentive Plan Unit Awards |  |  |  | 6,662 | 5,602 |
Rebalancing adjustment |  |  |  |  | (38,845) |
Balance | 104,010 | $ 84,760 |  | 104,010 | $ 84,760 | $ 95,422
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member | Restatement Adjustment |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance | $ 3,927 |  |  | $ 3,927 |  |

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