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Equity-based Compensation Plans - Summary of Equity-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Equity-based compensation expense:    
Equity based compensation expense $ 3,218 $ 719
Costs applicable to revenue    
Equity-based compensation expense:    
Equity based compensation expense 175 92
Selling, general, and administrative    
Equity-based compensation expense:    
Equity based compensation expense $ 3,043 $ 627