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Stock-Based Compensation - Stock Options and Restricted Stock Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 08, 2017
Feb. 28, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Proceeds from stock options exercised     $ 6,244,000 $ 1,712,000 $ 8,122,000
Tax benefit from stock options exercised     $ 2,600,000 $ 500,000 $ 3,100,000
Options granted (in shares)     243,000 77,000 133,000
Restricted stock granted (in shares)     77,000 138,000 155,000
Restricted stock vested (in shares)     146,000 178,000 171,000
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year    
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     4 years    
Certain Executive Employees | Subsequent event          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options granted (in shares) 91,795        
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     $ 3,800,000    
Unrecognized pre-tax stock-based compensation expense, period for recognition     1 year 10 months 24 days    
Stock options | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Stock options | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     4 years    
Stock options | Certain Executive Employees | Subsequent event          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period 3 years        
Options grant date fair value $ 1,800,000        
Stock options | Certain Executive Employees | Percent Vesting on February 8, 2018 | Subsequent event          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage 33.33%        
Stock options | Certain Executive Employees | Quarterly Vesting | Subsequent event          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage 8.33%        
Non-vested restricted stock award          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized pre-tax stock-based compensation expense     $ 7,800,000    
Unrecognized pre-tax stock-based compensation expense, period for recognition     1 year 6 months    
Non-vested restricted stock award | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     1 year    
Non-vested restricted stock award | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Non-vested restricted stock award | Certain Executive Employees | Subsequent event          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period   3 years      
Restricted stock granted (in shares)   96,705      
Restricted stock, grant date fair value   $ 6,100,000      
Non-vested restricted stock award | Certain Executive Employees | Percent Vesting on February 8, 2018 | Subsequent event          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage   33.33%      
Restricted stock vested (in shares)   28,705      
Non-vested restricted stock award | Certain Executive Employees | Quarterly Vesting | Subsequent event          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage   8.33%      
Non-vested restricted stock award | Certain Executive Employees | Percent Vesting on February 16, 2018 | Subsequent event          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights percentage   33.33%      
Restricted stock vested (in shares)   68,000