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Share and Unit-based Plans - Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share and unit-based plans [Line Items] |  |  |
Compensation cost under share and unit-based plans | $ 18,066 | $ 16,723 | $ 33,551
Capitalized share and unit-based compensation costs | 4,223 | 4,691 | 6,184
Stock units |  |  |
Share and unit-based plans [Line Items] |  |  |
Compensation cost under share and unit-based plans | 4,159 | 4,598 | 6,355
Unrecognized compensation cost of share and unit-based plans | 2,257 |  |
LTIP units |  |  |
Share and unit-based plans [Line Items] |  |  |
Compensation cost under share and unit-based plans | 13,339 | 11,372 | 26,311
Unrecognized compensation cost of share and unit-based plans | 3,007 |  |
Stock options |  |  |
Share and unit-based plans [Line Items] |  |  |
Compensation cost under share and unit-based plans | 0 | 51 | 125
Phantom stock units |  |  |
Share and unit-based plans [Line Items] |  |  |
Compensation cost under share and unit-based plans | 568 | 702 | 760
Unrecognized compensation cost of share and unit-based plans | 165 |  |
Stock awards and units |  |  |
Share and unit-based plans [Line Items] |  |  |
Fair value of equity-based awards vested during period | $ 1,376 | $ 3,577 | $ 6,479

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