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Stock Compensation Plans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options outstanding (in shares) 0 0  
Total Stock Compensation Expense and Related Net Tax Benefit [Abstract]      
Stock compensation costs $ 5,151 $ 4,575  
Related net tax benefit for stock compensation plans $ 4,414    
Related net tax benefit for stock compensation plans   $ 986  
RSUs | Ratably      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
RSUs | Cliff | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
RSUs | Cliff | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 5 years    
RSAs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding (in shares) 0 0  
Performance-Based RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding (in shares) 424,299   410,746
Performance-Based RSUs | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Potential for awards to vest (as a percent) 0.00%    
Performance-Based RSUs | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Potential for awards to vest (as a percent) 200.00%    
Performance-Based RSUs | Cliff      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years