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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance |  |  | $ 644,657 |
Net (loss) income | $ (38,289) | $ 8,840 | (33,422) | $ 6,539
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership |  | 0 | 0 | 0
Other comprehensive income (loss) - unrealized gain (loss) on valuation of swap agreements | 952 | (15,388) | (82,444) | (51,347)
Acquisition of noncontrolling interest |  |  | 588 |
Reclassification of realized interest on swap agreements | 5,506 | (288) | 9,598 | (1,374)
Noncontrolling interest contributions | 8,427 | 129,438 | 36,736 | 161,628
Noncontrolling interest distributions | (20,117) | (29,713) | (24,654) | (34,595)
Employee Long-term Incentive Plan Unit Awards | 2,413 | 1,916 | 8,551 | 7,361
Reallocation of noncontrolling interests | 0 | 0 | 0 | 0
Ending Balance | 598,870 |  | 598,870 |
Noncontrolling Interests |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 637,739 | 618,910 | 644,657 | 622,442
Distributions declared per Common OP Unit |  | (1,765) | (2,095) | (5,322)
Distributions on Preferred OP Units | (123) |  |  |
Net (loss) income | (29,259) | (1,618) | (35,388) | (25,196)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership |  | (720) | (6,544) | (4,230)
Other comprehensive income (loss) - unrealized gain (loss) on valuation of swap agreements | 17 | (1,115) | (21,691) | (8,006)
Cumulative effect of change in accounting principle (Note 1) |  |  | (11) |
Acquisition of noncontrolling interest |  |  | 588 |
Reclassification of realized interest on swap agreements | 2,105 | 7 | 3,543 | (61)
Noncontrolling interest contributions | 8,427 | 129,438 | 36,736 | 161,628
Noncontrolling interest distributions | (20,117) | (29,713) | (24,654) | (34,595)
Employee Long-term Incentive Plan Unit Awards | 2,181 | 1,768 | 7,973 | 6,965
Reallocation of noncontrolling interests | (2,100) | (5,251) | (4,244) | (3,684)
Ending Balance | 598,870 | 709,941 | 598,870 | 709,941
Noncontrolling Interests | Noncontrolling Interests in Partially-Owned Affiliates |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 547,418 | 515,205 | 546,987 | 518,219
Distributions declared per Common OP Unit |  | 0 | 0 | 0
Distributions on Preferred OP Units | 0 |  |  |
Net (loss) income | (28,907) | (2,403) | (35,958) | (27,633)
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership |  | 0 | 0 | 0
Other comprehensive income (loss) - unrealized gain (loss) on valuation of swap agreements | (166) | (251) | (18,423) | (5,320)
Cumulative effect of change in accounting principle (Note 1) |  |  | (11) |
Acquisition of noncontrolling interest |  |  | 588 |
Reclassification of realized interest on swap agreements | 2,042 | 23 | 3,432 |
Noncontrolling interest contributions | 8,427 | 129,438 | 36,736 | 161,628
Noncontrolling interest distributions | (20,117) | (29,713) | (24,654) | (34,595)
Employee Long-term Incentive Plan Unit Awards | 0 | 0 | 0 | 0
Reallocation of noncontrolling interests | 0 | 0 | 0 | 0
Ending Balance | 508,697 | 612,299 | 508,697 | 612,299
Noncontrolling Interests | Operating Partnership, as General Partner or Managing Member |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Beginning Balance | 90,321 | 103,705 | 97,670 | 104,223
Distributions declared per Common OP Unit |  | (1,765) | (2,095) | (5,322)
Distributions on Preferred OP Units | (123) |  |  |
Net (loss) income | (352) | 785 | 570 | 2,437
Conversion of OP Units to Common Shares by limited partners of the Operating Partnership |  | (720) | (6,544) | (4,230)
Other comprehensive income (loss) - unrealized gain (loss) on valuation of swap agreements | 183 | (864) | (3,268) | (2,686)
Reclassification of realized interest on swap agreements | 63 | (16) | 111 | (61)
Noncontrolling interest contributions | 0 | 0 | 0 | 0
Noncontrolling interest distributions | 0 | 0 | 0 | 0
Employee Long-term Incentive Plan Unit Awards | 2,181 | 1,768 | 7,973 | 6,965
Reallocation of noncontrolling interests | (2,100) | (5,251) | (4,244) | (3,684)
Ending Balance | $ 90,173 | $ 97,642 | $ 90,173 | $ 97,642

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