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Stock Based Compensation - Subsidiary Incentive Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Number of shares issuable      
Cash received for vested subsidiary awards   $ 50  
Repurchase of vested subsidiary awards $ 23 $ 1,079  
Common stock      
Number of shares issuable      
Shares issued in exchange for vested subsidiary awards (in shares) 481,829 1,158,009 [1]  
Subsidiary Incentive Plan | Common stock      
Number of shares issuable      
Shares issued in exchange for vested subsidiary awards (in shares)   1,158,009  
Cash received for vested subsidiary awards   $ 50  
Conversion of subsidiary awards, consideration received on transaction   12,168 $ 1,807
Repurchase of vested subsidiary awards   1,079  
Subsidiary Incentive Plan | Restricted Stock Units (RSUs)      
Number of shares issuable      
Unvested balance, beginning of period   4,305  
Granted   1,278  
Vested   (3,466)  
Unvested balance, end of period $ 2,117 $ 2,117  
Vested shares, if converted (in shares) 1,875,284 1,875,284  
[1] Exchange included $50 in cash.