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Stock-Based Compensation (Additional Information) (Details)
3 Months Ended 9 Months Ended 54 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
offering_periods
Sep. 30, 2015
USD ($)
Sep. 30, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options     $ 2,100,000    
Deferred Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense (income) $ 700,000 $ 0 $ 700,000 $ 0  
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, contractual term (years)     10 years    
Stock options, grants in period, gross | shares         0
Stock-based compensation, approximate forfeitures rate (percent)     3.00%    
Compensation expense (income)   100,000   200,000  
Options exercised, total intrinsic value     $ 1,400,000    
Performance-Based Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation, approximate forfeitures rate (percent)     12.00%    
Compensation expense (income) 1,100,000 1,200,000 $ 3,200,000 2,800,000  
Restricted stock award program, measurement period (years)     3 years    
Expected dividend yield (percent)     0.00%    
Performance-Based Restricted Stock | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)     0.00%    
Performance-Based Restricted Stock | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock award program, awarded shares as a percentage of the original award amount (percent)     200.00%    
Time Based Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation, approximate forfeitures rate (percent)     12.00%    
Compensation expense (income) 1,600,000 1,300,000 $ 4,300,000 3,800,000  
Employee Stock Purchase Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense (income) $ 100,000 $ 100,000 $ 300,000 $ 300,000  
Employee stock purchase plan, number of offering (offering period) | offering_periods     2    
Employee stock purchase plan, offering period (months)     6 months    
Employee stock purchase plan, purchase price discount (percent)     15.00%