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Stock-Based Compensation - Summary of Unrecognized Compensation Cost (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation costs, equity instruments other than options $ 3,669
Expected Weighted Average Period of Recognition (in years) 10 months 24 days
Restricted stock awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation costs, equity instruments other than options $ 1,510
Expected Weighted Average Period of Recognition (in years) 10 months 24 days
Stock options  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation costs, options $ 290
Expected Weighted Average Period of Recognition (in years) 1 year 1 month 6 days
Performance share units  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation costs, equity instruments other than options $ 918
Expected Weighted Average Period of Recognition (in years) 1 year
Stock appreciation rights  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unrecognized compensation costs, options $ 951
Expected Weighted Average Period of Recognition (in years) 6 months