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Stock Compensation Plans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options outstanding (in shares) 0 0 0 0  
Total Stock Compensation Expense and Related Net Tax Benefit [Abstract]          
Stock compensation costs $ 4,964 $ 4,635 $ 10,115 $ 9,210  
Related net tax benefit for stock compensation plans $ 49   $ 4,463    
Related net tax benefit for stock compensation plans   $ 19   $ 1,005  
RSAs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares outstanding (in shares) 0 0 0 0  
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    
Performance-Based RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares outstanding (in shares) 424,299   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