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Commitments and Contingencies - Rent Expense for the Company's Office Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Rent expense for office leases $ 2,195 $ 2,133
Held for sale | Luxury Disposition    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Rent expense for office leases $ 153 $ 101