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Stock Based Compensation - Schedule of RSUs under the Subsidiary Incentive Plans Rollforward (Details) - Subsidiary Incentive Plan - Restricted Stock Units (RSUs)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Unvested balance, beginning of period $ 4,305
Granted 1,079
Vested (1,358)
Unvested balance, end of period $ 4,026
Vested shares, if converted (in shares) | shares 2,570,055