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Share-based Payment Arrangements (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended 24 Months Ended
Jul. 22, 2016
Apr. 01, 2016
May 29, 2015
Apr. 01, 2015
Sep. 08, 2014
Apr. 10, 2013
Jul. 27, 2012
Jun. 30, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock options, Granted                 0 0 0  
Options contractual term                 1 year 8 months 12 days      
Other than options, granted   7,144   8,616                
Long Term Incentive Plan 2005 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share-based compensation arrangement by share-based payment award, incentive stock options to purchase number of shares                 335,074      
Share-based compensation arrangement by share-based payment award, non-qualified stock options to purchase number of shares                 289,157      
Share-based compensation arrangement by share-based payment award, restricted stock options to purchase number of shares                 151,901      
Long Term Incentive Plan 2015 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share-based compensation arrangement by share-based payment award, number of shares authorized                 2,000,000      
Share-based compensation arrangement by share-based payment award, restricted stock options to purchase number of shares                 292,961      
Stock options, Granted                 0      
Long Term Incentive Plan 2005 and 2015 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Unrecognized compensation cost related to non-vested awards                 $ 0      
Prior to 2009 Incentive Stock Options [Member] | Minimum [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock-based compensation incentive stock options grant under incentive plan termination period                 5 years      
Prior to 2009 Incentive Stock Options [Member] | Maximum [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock-based compensation incentive stock options grant under incentive plan termination period                 10 years      
Prior to 2009 Incentive Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | First Anniversary [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Percentage                 10.00%      
Prior to 2009 Incentive Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | Second Anniversary [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Percentage                 20.00%      
Prior to 2009 Incentive Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | Third Anniversary [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Percentage                 30.00%      
Prior to 2009 Incentive Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | Fourth Anniversary [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Percentage                 40.00%      
2009 Incentive Stock Options [Member] | Long Term Incentive Plan 2005 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock-based compensation incentive stock options grant under incentive plan termination period                 10 years      
Share-based compensation arrangement by share-based payment award, award vesting rights                 vest in equal annual increments on each of the first seven anniversary dates      
Incentive Stock Options 2010 [Member] | Long Term Incentive Plan 2005 [Member] | 25,000 Grant [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock-based compensation incentive stock options grant under incentive plan termination period                 10 years      
Share-based compensation arrangement by share based payment award options vested and expected to vest number                 25,000      
Share-based compensation arrangement by share-based payment award, award vesting rights                 vests in equal annual increments on each of the first three anniversary dates      
Non Qualified Stock Options [Member] | Long Term Incentive Plan 2005 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage                 100.00%      
Stock-based compensation incentive stock options grant under incentive plan termination period                 10 years      
Share-based compensation arrangement by share-based payment award, award vesting period                 6 months      
Non Qualified Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | 200,000 Grant [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Stock-based compensation incentive stock options grant under incentive plan termination period                 10 years      
Share-based compensation arrangement by share based payment award options vested and expected to vest number                 200,000      
Share-based compensation arrangement by share-based payment award, award vesting rights                 vests in equal annual increments on each of the first seven anniversary dates      
Restricted Stock Units (RSUs) [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Allocated share-based compensation expense                   $ 226 $ 49  
Allocated share based compensation benefit                 $ 156      
Income tax benefit of share-based payments recognized in income                   $ 79 $ 17  
Income tax expense of share-based payments recognized in income                 $ 55      
Restricted Stock Units (RSUs) [Member] | Minimum [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Percentage of restricted stock units granted as result of meeting growth rates                 50.00%      
Restricted Stock Units (RSUs) [Member] | Maximum [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Percentage of restricted stock units granted as result of meeting growth rates                 150.00%      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan 2005 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Other than options, granted         175,983 122,823 129,463     122,770    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period   7,144   8,616           7,144    
Other than options, forfeited               9,280   115,623    
Vested   7,144   8,616           7,144    
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan 2015 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Other than options, granted 122,770   103,351                  
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan 2005 and 2015 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Unrecognized compensation cost related to non-vested awards                 $ 141      
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Not Yet Recognized Next Twelve Months                 80      
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Expected to Recognize During Remainder of Year Two                 50      
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Expected to Recognize During Remainder of Year Three                 $ 11      
Other than options granted, weighted average grant date fair value                 $ 11.41 $ 11.10 $ 9.66 $ 9.20