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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
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ 420,866 |  |  |  |  | $ 420,866 |  |
Net (income) loss attributable to noncontrolling interests | $ (14,415) | $ 5,786 | $ (8,237) | $ (44,950) | $ 1,019 | $ (4,328) | $ (58,963) | $ (21,990) | (61,816) | $ (84,262) | $ (81,082)
Conversion of 100,620 Common OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  | (18,379) | (7,970) |
Issuance of OP Units to acquire real estate |  |  |  |  |  |  |  |  | 31,429 | 0 | 44,051
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  |  |  |  |  |  | (646) | (5,061) | (9,061)
Reclassification of realized interest on swap agreements |  |  |  |  |  |  |  |  | 4,576 | 5,524 | 3,776
Noncontrolling interest contributions |  |  |  |  |  |  |  |  | 295,108 | 35,489 | 57,969
Noncontrolling interest distributions and other reductions |  |  |  |  |  |  |  |  | (80,769) | (74,950) | (218,152)
Employee Long-term Incentive Plan Unit Awards |  |  |  |  |  |  |  |  | 13,694 | 8,644 | 8,460
Balance | $ 589,548 |  |  |  | $ 420,866 |  |  |  | 589,548 | 420,866 |
Payments to noncontrolling interests |  |  |  |  |  |  |  |  | $ 105,994 | $ 84,610 | $ 221,330
Distributions declared (in dollars per share) | $ 0.41 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.50 | $ 0.24 | $ 0.24 | $ 0.24 | $ 1.16 | $ 1.22 | $ 1.23
Limited partners' capital account, units issued and converted (in shares) | 351,250 |  |  |  | 100,620 |  |  |  | 351,250 | 100,620 | 136,128
LTIP Units [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
LTIP units outstanding (in shares) | 1,996,388 |  |  |  | 1,922,623 |  |  |  | 1,996,388 | 1,922,623 |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Limited partners' capital account, units issued and converted (in shares) | 1,392 |  |  |  |  |  |  |  | 1,392 |  |
Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Series A Preferred OP Units (in shares) | 141,593 |  |  |  |  |  |  |  | 141,593 |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ 420,866 |  |  |  | $ 380,416 | $ 420,866 | $ 380,416 | $ 417,352
Distributions declared of $1.22 per Common OP Unit |  |  |  |  |  |  |  |  | (6,753) | (5,983) | (5,085)
Net (income) loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 61,816 | 84,262 | 81,082
Conversion of 100,620 Common OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  |  |  |  |  |  | (7,892) | (2,451) | (3,181)
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  | (25,925) | (3,561) |
Change in control of previously consolidated investment (Note 4) |  |  |  |  |  |  |  |  | (75,713) |  |
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  | (25,925) |  |
Issuance of OP Units to acquire real estate |  |  |  |  |  |  |  |  | 31,429 |  | 44,051
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  |  |  |  |  |  | (331) | (1,014) | (1,247)
Reclassification of realized interest on swap agreements |  |  |  |  |  |  |  |  | 596 | 1,935 | 1,099
Noncontrolling interest contributions |  |  |  |  |  |  |  |  | 295,108 | 35,489 | 57,969
Noncontrolling interest distributions and other reductions |  |  |  |  |  |  |  |  | (80,769) | (74,950) | (218,152)
Employee Long-term Incentive Plan Unit Awards |  |  |  |  |  |  |  |  | 12,768 | 6,723 | 6,528
Balance | $ 589,548 |  |  |  | $ 420,866 |  |  |  | 589,548 | 420,866 | 380,416
Noncontrolling Interests | Partially-Owned Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 324,526 |  |  |  | 286,181 | 324,526 | 286,181 | 368,404
Distributions declared of $1.22 per Common OP Unit |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (income) loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 56,814 | 80,426 | 77,878
Conversion of 100,620 Common OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  |  |  |  |  |  | 0 | 0 | 0
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  |  | (3,561) |
Change in control of previously consolidated investment (Note 4) |  |  |  |  |  |  |  |  | 0 |  |
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  | (25,925) |  |
Issuance of OP Units to acquire real estate |  |  |  |  |  |  |  |  | 0 |  | 0
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  |  |  |  |  |  | (288) | (897) | (902)
Reclassification of realized interest on swap agreements |  |  |  |  |  |  |  |  | 373 | 1,838 | 984
Noncontrolling interest contributions |  |  |  |  |  |  |  |  | 295,108 | 35,489 | 57,969
Noncontrolling interest distributions and other reductions |  |  |  |  |  |  |  |  | (80,769) | (74,950) | (218,152)
Employee Long-term Incentive Plan Unit Awards |  |  |  |  |  |  |  |  | 0 | 0 | 0
Balance | $ 569,839 |  |  |  | $ 324,526 |  |  |  | $ 569,839 | $ 324,526 | $ 286,181
Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Series A Preferred OP Units (in shares) | 3,365,668 |  |  |  | 2,931,198 |  |  |  | 3,365,668 | 2,931,198 |
Equity Interest Held By Operating Partnership |  |  |  |  |  |  |  |  | 95.00% | 95.00% |
Operating Partnership, as General Partner or Managing Member [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Series A Preferred OP Units (in shares) | 188 |  |  |  | 188 |  |  |  | 188 | 188 | 188
Operating Partnership, as General Partner or Managing Member [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Series A Preferred OP Units (in shares) |  | 141,593 |  |  |  |  |  |  |  |  |
Operating Partnership, as General Partner or Managing Member [Member] | Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | 96,340 |  |  |  | $ 94,235 | $ 96,340 | $ 94,235 | $ 48,948
Distributions declared of $1.22 per Common OP Unit |  |  |  |  |  |  |  |  | (6,753) | (5,983) | (5,085)
Net (income) loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 5,002 | 3,836 | 3,204
Conversion of 100,620 Common OP Units to Common Shares by limited partners of the Operating Partnership |  |  |  |  |  |  |  |  | (7,892) | (2,451) | (3,181)
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  |  | 0 |
Change in control of previously consolidated investment (Note 4) |  |  |  |  |  |  |  |  | (75,713) |  |
Acquisition of noncontrolling interests |  |  |  |  |  |  |  |  | 0 |  |
Issuance of OP Units to acquire real estate |  |  |  |  |  |  |  |  | 31,429 |  | 44,051
Other comprehensive income - unrealized loss on valuation of swap agreements |  |  |  |  |  |  |  |  | (43) | (117) | (345)
Reclassification of realized interest on swap agreements |  |  |  |  |  |  |  |  | 223 | 97 | 115
Noncontrolling interest contributions |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noncontrolling interest distributions and other reductions |  |  |  |  |  |  |  |  | 0 | 0 | 0
Employee Long-term Incentive Plan Unit Awards |  |  |  |  |  |  |  |  | 12,768 | 6,723 | 6,528
Balance | $ 19,709 |  |  |  | $ 96,340 |  |  |  | $ 19,709 | 96,340 | $ 94,235
Fund II [Member] |  |  |  |  |  |  |  |  |  |  |
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% |  |
Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance |  |  |  | $ (31,800) |  |  |  |  | $ (31,800) |  |
Net (income) loss attributable to noncontrolling interests | 1,600 |  |  |  |  |  |  |  |  |  |
Balance | (35,700) |  |  |  | $ (31,800) |  |  |  | (35,700) | $ (31,800) |
Restatement Adjustment [Member] | Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance | (35,652) |  |  |  |  |  |  |  | (35,652) |  |
Restatement Adjustment [Member] | Noncontrolling Interests | Partially-Owned Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance | 0 |  |  |  |  |  |  |  | 0 |  |
Restatement Adjustment [Member] | Operating Partnership, as General Partner or Managing Member [Member] | Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance | $ (35,652) |  |  |  |  |  |  |  | $ (35,652) |  |

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