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Stock-Based Compensation - Management incentive plan prior to IPO (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 15, 2019
Dec. 31, 2018
Dec. 31, 2017
Management Incentive Plan                  
Stock compensation charge   $ 410   $ 0 $ 23,677 $ 0      
Increase in additional paid in capital         $ 23,677        
2014 Management Incentive Plan                  
Management Incentive Plan                  
Units outstanding             12,552,825 12,552,825 12,432,825
Stock compensation charge $ 23,000   $ 23,000            
Increase in additional paid in capital     $ 23,000