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Commitments and Contingencies - Rent Expense for the Company's Office Leases (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Rent expense for office leases $ 2,074 $ 959 $ 6,520 $ 5,196
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   $ 134 $ 306 $ 374