| Stock-Based Compensation - Vested and unvested LTIP units (Details) shares in Thousands | 9 Months Ended | 
|---|---|
| Sep. 30, 2021  shares | |
| Stock-Based Compensation | |
| Total vested units | 1,452 | 
| Total unvested units | 738 | 
| LTIP Units outstanding as of September 30, 2020 | 2,190 | 
| X | ||||||||||
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- References No definition available. 
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| X | ||||||||||
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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| X | ||||||||||
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- Definition Number of non-vested options outstanding. No definition available. 
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| X | ||||||||||
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- Definition Number of options vested. No definition available. 
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