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Employee Benefit Plans - Restricted Stock Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee Benefit Plans      
Compensation cost $ 8,800 $ 7,400 $ 9,000
Restricted stock      
Employee Benefit Plans      
Compensation cost 2,800 966 335
Unrecognized compensation cost $ 8,400 $ 3,900 $ 208
Period for recognition 3 years    
Shares      
Unvested restricted stock, beginning balance (in shares) 2,347,347    
Granted (in shares) 3,201,892    
Vested (in shares) (920,679)    
Forfeited (in shares) (20,000)    
Unvested restricted stock, end balance (in shares) 4,608,560 2,347,347  
Aggregate Intrinsic Value      
Unvested restricted stock aggregate intrinsic value $ 14,563    
Restricted stock | Minimum      
Employee Benefit Plans      
Vesting period 1 year    
Restricted stock | Maximum      
Employee Benefit Plans      
Vesting period 3 years