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Stock-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation $ 2,462 $ 2,823 $ 4,814 $ 4,986
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     827,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Based, Grants in Period     622,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     424,000  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum     35.88%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum     42.19%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum     1.14%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum     1.85%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate, Minimum     2.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate, Maximum     6.40%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Minimum     3 years 6 months  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Maximum     5 years 9 months  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price     $ 11.62  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     2.92  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 9.14  
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