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Stock Compensation Plans - Additional Information (Details)
1 Months Ended 12 Months Ended
May 31, 2016
shares
May 31, 2014
shares
Dec. 31, 2016
USD ($)
plan
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of Compensation Plans | plan     3    
Total intrinsic value of stock options exercised | $     $ 1,700,000 $ 1,700,000 $ 2,200,000
Fair value of stock options vested | $     3,800,000 3,900,000 3,700,000
Allocated share-based compensation expense | $     5,374,000 $ 4,306,000 $ 4,678,000
Unrecognized stock-based compensation expense | $     $ 8,300,000    
Weighted average, expected recognition period     1 year 9 months 22 days    
Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options outstanding     1,090,160 1,178,585  
Number of stock options unvested (in shares)     23,328    
Employee Stock Option | Black-Scholes Option Valuation Model          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock option weighted average grant date fair value (in dollars per share) | $ / shares     $ 12.90 $ 15.08 $ 19.38
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period, years     3 years    
Number of restricted stock units vested (in shares)     13,247    
Number of restricted stock units unvested (in shares)     677    
Number of performance based shares granted (in shares)     159,625    
Restricted Stock Units (RSUs) | Non Executive Employee          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period, years     3 years    
Number of performance based shares granted (in shares) 18,615        
Performance Based Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of restricted stock units vested (in shares)       226  
Number of restricted stock units unvested (in shares)     677    
Performance Based Restricted Stock Units | Share-based Compensation Award, Tranche One | Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Performance Based Restricted Stock Units | Share-based Compensation Award, Tranche Two | Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Performance Based Restricted Stock Units | Share-based Compensation Award, Tranche Three | Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Performance Based Employee Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock options vested (in shares)       7,225  
Number of stock options unvested (in shares)     23,328    
Performance Based Employee Stock Options | Share-based Compensation Award, Tranche One | Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Performance Based Employee Stock Options | Share-based Compensation Award, Tranche Two | Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Performance Based Employee Stock Options | Share-based Compensation Award, Tranche Three | Executive Officer          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period, years     3 years    
Number of performance based shares granted (in shares)     0    
Prior to Fiscal Year 2016 | Employee Stock Option | Share-based Compensation Award, Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Prior to Fiscal Year 2016 | Employee Stock Option | Share-based Compensation Award, Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Prior to Fiscal Year 2016 | Employee Stock Option | Share-based Compensation Award, Tranche Three          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Prior to Fiscal Year 2016 | Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Prior to Fiscal Year 2016 | Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Prior to Fiscal Year 2016 | Restricted Stock Units (RSUs) | Share-based Compensation Award, Tranche Three          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Fiscal Year 2016 | Employee Stock Option | Share-based Compensation Award, Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Fiscal Year 2016 | Employee Stock Option | Share-based Compensation Award, Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
Fiscal Year 2016 | Employee Stock Option | Share-based Compensation Award, Tranche Three          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting installment percentage     33.33%    
2004 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares of common stock authorized for grant awards     1,750,000    
Options outstanding     3,500    
Exercise price, lower range | $ / shares     $ 24.36    
Expiration period, years     10 years    
2004 Plan | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period, years     3 years    
2004 Plan | 2010 Change In Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period, years     7 years    
2009 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares of common stock authorized for grant awards     1,781,546    
Options outstanding     504,658    
Exercise price, lower range | $ / shares     $ 24.30    
Exercise price, upper range | $ / shares     $ 57.54    
Expiration period, years     10 years    
2009 Plan | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period, years     3 years    
2009 Plan | 2010 Change In Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period, years     7 years    
2014 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares of common stock authorized for grant awards   1,974,543      
Options outstanding     517,171    
Exercise price, lower range | $ / shares     $ 29.98    
Exercise price, upper range | $ / shares     $ 62.63    
Expiration period, years     7 years    
2014 Plan | Employee Stock Option          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period, years   3 years      
Director's Plan, Per Director          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted shares granted based on percent of director compensation     50.00%    
Director's Plan, Per Director | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period, years     3 years    
Value of shares granted upon election | $     $ 100,000