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Stockholders' Equity and Non-Controlling Interests - Equity Incentive Plans (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2020
Sep. 30, 2019
Apr. 30, 2018
Mar. 31, 2017
Jun. 30, 2021
Jun. 30, 2021
Equity Incentive Plans            
Granted (in shares)           1,646,994
2017 Manager Equity Plan            
Equity Incentive Plans            
Granted (in shares)           0
Restricted stock units | 2017 Manager Equity Plan            
Equity Incentive Plans            
Granted (in shares) 1,800,000 1,200,000 775,000 1,000,000    
Awards granted, fair value $ 30,078 $ 29,484 $ 16,329 $ 22,240    
Award vesting period 3 years   3 years 3 years    
Restricted stock units | 2017 Manager Equity Plan | Vested immediately on the grant date            
Equity Incentive Plans            
Granted (in shares)   218,898        
Restricted stock units | 2017 Manager Equity Plan | Remaining vesting            
Equity Incentive Plans            
Award vesting period         3 years