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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 1,862 $ (698)
Stock options granted 452,000  
Performance-based restricted stock units granted 673,000  
Time-vesting restricted stock units granted 490,000  
Expected volatility rate, minimum 44.97%  
Expected volatility rate, maximum 53.51%  
Risk free interest rate, minimum 2.07%  
Risk free interest rate, maximum 2.68%  
Expected dividend yield, maximum 0.00%  
Expected life, minimum 3 years 6 months  
Expected life, maximum 5 years 9 months  
Weighted average exercise price of options granted $ 8.72  
Weighted average grant date fair value of options granted 3.80  
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 8.58  
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 $ 9.03