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Stock Based Compensation - Cash Performance Units (Details) - Cash Performance - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2017
Number of Cash Performance Units    
Units outstanding at the beginning of the period (in shares) 425,012  
Granted (in shares)   932,837
Vested (in shares) (212,505)  
Forfeited (in shares) (71,435)  
Units outstanding at the end of the period (in shares) 141,072  
Vesting period 3 years  
Accrued expenses    
Number of Cash Performance Units    
Cash performance liability $ 65