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Stock Options (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
May 07, 2015
May 07, 2009
May 03, 2005
May 03, 2001
Qualified Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares) 21,000 29,500 48,250        
Weighted average grant date fair value of options granted (in dollars per share) $ 27.48 $ 27.63 $ 27.23        
Total unrecognized compensation cost related to non-vested share-based compensation arrangements $ 1,302            
Period cost is expected to be recognized (years) 5 years            
Exercise of stock options (in shares) (43,775) (75,355) (27,700)        
Non Qualified Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (in shares) 0 0 29,000        
Weighted average grant date fair value of options granted (in dollars per share)     $ 27.72        
Total unrecognized compensation cost related to non-vested share-based compensation arrangements $ 53            
Period cost is expected to be recognized (years) 5 years            
Exercise of stock options (in shares) (14,900) (4,800) (11,600)        
Proceeds from stock options exercised $ 205 $ 55 $ 270        
Tax deductions from the exercise of stock options 657 $ 187 $ 262        
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total unrecognized compensation cost related to non-vested share-based compensation arrangements $ 1,959            
Period cost is expected to be recognized (years) 4 years            
Weighted average remaining contractual life (years) 2 years 10 months 21 days 3 years 1 month 10 days 2 years 4 months 21 days        
Restricted Stock Units (RSUs) | Year One after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 25.00%            
Award vesting period (years) 1 year            
Restricted Stock Units (RSUs) | Year Two after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 25.00%            
Restricted Stock Units (RSUs) | Year Three after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 25.00%            
Restricted Stock Units (RSUs) | Year Four after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 25.00%            
2015 ISO Plan | Qualified Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock reserved for options to be issued (in shares)       400,000      
Granted (in shares) 21,000 29,500          
2015 ISO Plan | Qualified Stock Options | Year One after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period (years) 1 year            
2015 ISO Plan | Qualified Stock Options | Year One after Grant Date | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2015 ISO Plan | Qualified Stock Options | Year Two after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2015 ISO Plan | Qualified Stock Options | Year Three after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2015 ISO Plan | Qualified Stock Options | Year Four after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2015 ISO Plan | Qualified Stock Options | Year Five after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2005 Incentive Stock Option Plan | Qualified Stock Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock reserved for options to be issued (in shares)           500,000  
Granted (in shares)     48,250        
2005 Incentive Stock Option Plan | Qualified Stock Options | Year One after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period (years) 1 year            
2005 Incentive Stock Option Plan | Qualified Stock Options | Year One after Grant Date | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2005 Incentive Stock Option Plan | Qualified Stock Options | Year Two after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2005 Incentive Stock Option Plan | Qualified Stock Options | Year Three after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2005 Incentive Stock Option Plan | Qualified Stock Options | Year Four after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2005 Incentive Stock Option Plan | Qualified Stock Options | Year Five after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
FAR 1999 NQSO Plan | Non Qualified Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock reserved for options to be issued (in shares)             400,000
FAR 1999 NQSO Plan | Non Qualified Options | Year One after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period (years) 1 year            
FAR 1999 NQSO Plan | Non Qualified Options | Year One after Grant Date | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
FAR 1999 NQSO Plan | Non Qualified Options | Year Two after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
FAR 1999 NQSO Plan | Non Qualified Options | Year Three after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
FAR 1999 NQSO Plan | Non Qualified Options | Year Four after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
FAR 1999 NQSO Plan | Non Qualified Options | Year Five after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2009 Equity Incentive Plan | Non Qualified Options              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares of common stock reserved for options to be issued (in shares)         400,000    
2009 Equity Incentive Plan | Non Qualified Options | Year One after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period (years) 1 year            
2009 Equity Incentive Plan | Non Qualified Options | Year One after Grant Date | Maximum              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2009 Equity Incentive Plan | Non Qualified Options | Year Two after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2009 Equity Incentive Plan | Non Qualified Options | Year Three after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2009 Equity Incentive Plan | Non Qualified Options | Year Four after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%            
2009 Equity Incentive Plan | Non Qualified Options | Year Five after Grant Date              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Annual vesting percentage of award 20.00%