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Share-Based Payment Arrangements (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options, Granted     0 0    
Long Term Incentive Plan 2005 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of incentive stock options to purchase shares of common stock outstanding     158,673      
Number of non-qualified stock options to purchase shares of common stock outstanding     259,157      
Number of restricted stock units to receive shares of common stock     77,640      
Long Term Incentive Plan 2005 [Member] | Option Issued Prior to 2009 [Member] | Share-based Compensation Award, Tranche One [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of options vested or expected to vest 10.00%   10.00%      
Long Term Incentive Plan 2005 [Member] | Option Issued Prior to 2009 [Member] | Share-based Compensation Award, Tranche Two [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of options vested or expected to vest 20.00%   20.00%      
Long Term Incentive Plan 2005 [Member] | Option Issued Prior to 2009 [Member] | Share-based Compensation Award, Tranche Three [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of options vested or expected to vest 30.00%   30.00%      
Long Term Incentive Plan 2005 [Member] | Option Issued Prior to 2009 [Member] | Share-based Compensation Award, Tranche Four [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of options vested or expected to vest 40.00%   40.00%      
Long Term Incentive Plan 2015 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock compensation plan, number of shares authorized 2,000,000   2,000,000      
Number of restricted stock units to receive shares of common stock     501,029      
Incentive Stock Options 2010 [Member] | Long Term Incentive Plan 2005 [Member] | 25,000 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Incentive stock options termination period     10 years      
Number of options vested or expected to vest 25,000   25,000      
Share-based payment 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%      
Incentive stock options termination period     10 years      
Share-based payment, 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]            
Incentive stock options termination period     10 years      
Number of options vested or expected to vest 200,000   200,000      
Share-based payment 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]            
Total unrecognized compensation cost related to non-vested share-based compensation arrangements $ 1,400   $ 1,400      
Compensation costs expected to be recognized during remainder of the fiscal period 200   200      
Restricted stock or unit expense 51   97      
Restricted stock expense, benefit portion   $ 249   $ 59    
Compensation costs expected to be recognized during year two 600   600      
Compensation costs expected to be recognized in third future fiscal year 500   500      
Compensation costs expected to be recognized during year four 100   $ 100      
Other than options, granted     138,712 122,770    
Other than options, forfeited     43,509 94,880    
Vested     5,998 7,144    
Income tax benefit of share-based payments recognized in income $ 18   $ 34      
Income tax expense of share-based payments recognized in income   $ 88   $ 21    
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%   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%   150.00%      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan 2005 and 2015 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Other than options, grant date fair value     $ 11.41   $ 10.20 $ 11.10