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Employee Equity-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Equity-based compensation expense $ 3,397 $ 5,602  
Unrecognized equity-based compensation cost 22,500    
Shares issuable upon the release of restricted stock awards      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Unrecognized equity-based compensation cost, restricted stock units 400    
Performance-based stock options      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Equity-based compensation expense $ 100    
Contractual life 10 years    
Granted (shares)     225,000
Performance-based stock options | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Vesting period 1 year    
Performance-based stock options | Minimum | Granted in 2018      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Vesting period 5 years    
Performance-based stock options | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Vesting period 2 years    
Performance-based stock options | Maximum | Granted in 2018      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Vesting period 6 years    
Property and equipment      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]      
Equity-based compensation expense $ 100 $ 200