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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 1,800 $ 2,500 $ 1,079 $ 4,814
Stock options granted     756,000  
Performance-based restricted stock units granted     490,000  
Time-vesting restricted stock units granted     466,000  
Expected volatility rate, minimum     43.75%  
Expected volatility rate, maximum     52.52%  
Risk free interest rate, minimum     1.54%  
Risk free interest rate, maximum     2.07%  
Expected dividend yield, minimum     2.84%  
Expected dividend yield, maximum     3.85%  
Expected life, minimum     3 years 6 months  
Expected life, maximum     5 years 9 months  
Weighted average exercise price of options granted     $ 8.97  
Weighted average grant date fair value of options granted     2.73  
Weighted average grant date fair value of restricted stock units granted     $ 9.00  
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used     Black-Scholes  
Performance-based restricted stock units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used     Monte Carlo