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Stock Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
May 16, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total compensation cost not yet recognized   $ 3,680    
Granted (in shares)   406,875 427,219 448,580
Exercise price of options (in dollars per share)   $ 22.13 $ 20.95 $ 16.97
Option exercises in period, intrinsic value   $ 309 $ 1,151 $ 3,539
Tax benefit of options exercised   579 821 1,178
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 2,203 1,675 1,573
Contractual term   10 years    
Total compensation cost not yet recognized, period for recognition   1 year 3 months 21 days    
Tax benefit of options exercised   $ 116 $ 821 $ 1,178
Stock Options [Member] | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   3 years    
Stock Options [Member] | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   7 years    
2014 Management Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual short-term cash incentives performance period 12 months      
Shares available for issuance   7,823,451