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Stock-Based Compensation - Allocated Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost    
Total stock-based compensation $ 3,323 $ 2,095
Equity awards    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost    
Total stock-based compensation 2,357 1,794
Liability awards    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost    
Total stock-based compensation $ 966 $ 301