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Employee Equity-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Equity-based compensation expense $ 3,131 $ 3,465 $ 9,409 $ 12,476  
Unrecognized equity-based compensation cost 27,100   27,100    
Shares issuable upon the release of restricted stock awards          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Unrecognized equity-based compensation cost, restricted stock units $ 200   200    
Performance-based stock options          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Equity-based compensation expense     $ 100    
Contractual life     10 years    
Granted (shares)         225,000
Outstanding (shares) 125,000   125,000    
Performance-based stock options | Minimum          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Vesting period     1 year    
Performance-based stock options | Minimum | Granted in 2018          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Vesting period     5 years    
Performance-based stock options | Maximum          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Vesting period     2 years    
Performance-based stock options | Maximum | Granted in 2018          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Vesting period     6 years    
Property and equipment          
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]          
Equity-based compensation expense $ 100 $ 100 $ 300 $ 400