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Share-Based Payment Arrangements (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Income tax benefit of share-based payments recognized in income $ 9 $ 9      
Stock options, Granted 0 0      
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%        
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%        
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%        
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%        
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        
Number of incentive stock options to purchase shares of common stock outstanding 127,574        
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 324,440        
Other than options, grant date fair value     $ 10.20 $ 11.41 $ 11.10
Allocated share-based compensation expense $ 44 $ 27      
Stock options, Granted 0        
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        
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        
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 $ 400        
Compensation costs expected to be recognized during remainder of the fiscal period 100        
Compensation costs expected to be recognized during next fiscal year 200        
Compensation costs expected to be recognized in second future fiscal year $ 100        
Other than options, granted      
Other than options, forfeited 161,288 43,509      
Vested 8,198 5,998      
Restricted Stock Units (RSUs) [Member] | Long Term Incentive Plan 2015 [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