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Shareholders' Equity, Noncontrolling Interests and Other Comprehensive Loss - Summary of Change in Noncontrolling Interest (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  |  |  | $ 607,239 |
Net income |  | $ 1,231 | $ 64,906 | 3,091 | $ 4,867
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership |  | 0 | 0 | 0 | 0
Other comprehensive income (loss) - unrealized gain (loss) on valuation of swap agreements |  | (10,073) | (8,621) | 23,483 | (83,395)
Reclassification of realized interest on swap agreements |  | 5,324 | 3,115 | 10,641 | 4,092
Noncontrolling interest contributions |  | 5,868 | 21,041 | 17,109 | 28,309
Noncontrolling interest distributions |  | (4,355) | (1,418) | (11,031) | (4,536)
Employee Long-term Incentive Plan Unit Awards |  | 2,624 | 2,317 | 7,135 | 6,136
Noncontrolling interest gain |  | (2,687) | 45,496 | (5,989) | (6,129)
Reallocation of noncontrolling interests |  | 0 | 0 | 0 | 0
Ending Balance |  | 617,659 |  | 617,659 |
Noncontrolling Interests |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance |  | 617,522 | 577,096 | 607,239 | 644,657
Distributions declared per Common OP Unit |  | 1,052 | 123 | (2,100) | (1,972)
Net income |  | (2,687) | 45,496 | (5,989) | (6,129)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership |  | (115) | (4,072) | (409) | (6,544)
Other comprehensive income (loss) - unrealized gain (loss) on valuation of swap agreements |  | (663) | (2,179) | 3,380 | (21,708)
Reclassification of realized interest on swap agreements |  | 1,861 | 1,167 | (3,762) | (1,439)
Noncontrolling interest contributions |  | 5,868 | 21,041 | 17,109 | 28,309
Noncontrolling interest distributions |  | (4,355) | (1,418) | (11,031) | (4,536)
Employee Long-term Incentive Plan Unit Awards |  | 2,399 | 2,142 | 6,448 | 5,790
Noncontrolling interest gain |  |  | (588) |  | (588)
Reallocation of noncontrolling interests | [1] | (1,119) | (1,999) | (750) | (2,144)
Ending Balance |  | 617,659 | 637,739 | 617,659 | 637,739
Noncontrolling Interests | Cumulative Effect of Change in Accounting Principle |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Ending Balance |  |  | (11) |  | (11)
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | [2] | 522,592 | 483,714 | 517,808 | 546,987
Distributions declared per Common OP Unit | [2] | 0 | 0 | 0 | 0
Net income | [2] | (3,085) | 44,237 | (6,857) | (7,052)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership | [2] | 0 | 0 | 0 | 0
Other comprehensive income (loss) - unrealized gain (loss) on valuation of swap agreements | [2] | (257) | (1,869) | 1,886 | (18,257)
Reclassification of realized interest on swap agreements | [2] | 1,808 | 1,125 | (3,656) | (1,390)
Noncontrolling interest contributions | [2] | 5,868 | 21,041 | 17,109 | 28,309
Noncontrolling interest distributions | [2] | (4,355) | (1,418) | (11,031) | (4,536)
Employee Long-term Incentive Plan Unit Awards | [2] | 0 | 0 | 0 | 0
Noncontrolling interest gain | [2] |  | (588) |  | (588)
Reallocation of noncontrolling interests | [1],[2] | 0 | 0 | 0 | 0
Ending Balance | [2] | 522,571 | 547,418 | 522,571 | 547,418
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates | Cumulative Effect of Change in Accounting Principle |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Ending Balance | [2] |  | (11) |  | (11)
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Beginning Balance | [3] | 94,930 | 93,382 | 89,431 | 97,670
Distributions declared per Common OP Unit | [3] | 1,052 | 123 | (2,100) | (1,972)
Net income | [3] | 398 | 1,259 | 868 | 923
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership | [3] | (115) | (4,072) | (409) | (6,544)
Other comprehensive income (loss) - unrealized gain (loss) on valuation of swap agreements | [3] | (406) | (310) | 1,494 | (3,451)
Reclassification of realized interest on swap agreements | [3] | 53 | 42 | (106) | (49)
Noncontrolling interest contributions | [3] | 0 | 0 | 0 | 0
Noncontrolling interest distributions | [3] | 0 | 0 | 0 | 0
Employee Long-term Incentive Plan Unit Awards | [3] | 2,399 | 2,142 | 6,448 | 5,790
Noncontrolling interest gain | [3] |  | 0 |  | 0
Reallocation of noncontrolling interests | [1],[3] | (1,119) | (1,999) | (750) | (2,144)
Ending Balance | [3] | $ 95,088 | 90,321 | $ 95,088 | 90,321
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member | Cumulative Effect of Change in Accounting Principle |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Ending Balance | [3] |  | $ 0 |  | $ 0
[1] | Adjustment reflects the difference between the fair value of the consideration received or paid and the book value of the Common Shares, Common OP Units, Preferred OP Units, and LTIP Units involving changes in ownership.
[2] | Noncontrolling interests in partially-owned affiliates comprise third-party interests in Funds II, III, IV and V, and Mervyns II, and six other subsidiaries.
[3] | Noncontrolling interests in the Operating Partnership are comprised of (i) the limited partners’ 3,101,958 Common OP Units at each of June 30, 2021 and 2020; (ii) 188 Series A Preferred OP Units at each of June 30, 2021 and 2020; (iii) 126,593 Series C Preferred OP Units at each of June 30, 2021 and 2020; and (iv) 3,434,894 and 2,886,207 LTIP units at June 30, 2021 and 2020, respectively, as discussed in Share Incentive Plan (Note 13). Distributions declared for Preferred OP Units are reflected in net income (loss) in the table above.

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