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Stock-Based Compensation - Stock Options and Restricted Stock Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 10, 2016
Jan. 01, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Proceeds from stock options exercised     $ 1,712 $ 8,122 $ 12,371
Tax benefit from stock options exercised     $ 500 $ 3,100 $ 2,300
Options granted (in shares)     77,000 133,000 201,000
Restricted stock granted (in shares)     138,000 155,000 196,000
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year    
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     4 years    
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Modification expense     $ 0 $ 0 $ 0
Unrecognized pre-tax stock-based compensation expense     $ 2,100    
Unrecognized pre-tax stock-based compensation expense, period for recognition     1 year 9 months 18 days    
Stock options | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Stock options | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     4 years    
Non-vested restricted stock award          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized pre-tax stock-based compensation expense     $ 10,700    
Unrecognized pre-tax stock-based compensation expense, period for recognition     2 years 1 month 6 days    
Non-vested restricted stock award | Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year    
Non-vested restricted stock award | Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Subsequent event | Certain Executive Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares)   93,135      
Subsequent event | Non-executives [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares) 150,000        
Subsequent event | Stock options | Certain Executive Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Options grant date fair value   $ 1,800      
Subsequent event | Stock options | Certain Executive Employees | Percent Vesting on January 1, 2017 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage   33.33%      
Subsequent event | Stock options | Certain Executive Employees | Quarterly Vesting          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage   8.33%      
Subsequent event | Stock options | Non-executives [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 3 years        
Options grant date fair value $ 2,600        
Subsequent event | Stock options | Non-executives [Member] | Percent Vesting on February 10, 2017 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage 33.33%        
Subsequent event | Non-vested restricted stock award | Certain Executive Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Restricted stock granted (in shares)   34,060      
Restricted stock, grant date fair value (in dollars per share)   $ 1,800      
Subsequent event | Non-vested restricted stock award | Certain Executive Employees | Percent Vesting on January 1, 2017 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage   33.33%      
Subsequent event | Non-vested restricted stock award | Certain Executive Employees | Quarterly Vesting          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage   8.33%