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Stock-Based Compensation - Management incentive plan prior to IPO (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 15, 2019
Management Incentive Plan              
Stock compensation charge   $ 464 $ 306   $ 907 $ 23,267  
Increase in additional paid in capital         $ 907 $ 23,267  
2014 Management Incentive Plan              
Management Incentive Plan              
Units outstanding             12,552,825
Stock compensation charge $ 23,000     $ 23,000      
Increase in additional paid in capital       $ 23,000