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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 2,000 $ 1,100 $ 2,691 $ 2,995
Stock options granted     255,000  
Performance-based restricted stock units granted     278,000  
Time-vesting restricted stock units granted     193,000  
Expected volatility rate, minimum     48.28%  
Expected volatility rate, maximum     55.17%  
Risk free interest rate, minimum     2.30%  
Risk free interest rate, maximum     2.34%  
Expected live, minimum     3 years 6 months  
Expected live, maximum     5 years 9 months  
Weighted average exercise price of options granted     $ 20.87  
Weighted average grant date fair value of options granted     9.33  
Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value of restricted stock units granted     15.83  
Performance-based restricted stock units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average grant date fair value of restricted stock units granted     $ 11.42