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Share-based Payment Arrangements (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended 36 Months Ended
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options, Granted       0
Options contractual term   1 year 2 months 12 days      
Percentage of restricted stock units granted as result of meeting growth rates   50.00%     50.00%
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   147,574      
Share-based compensation arrangement by share-based payment award, non-qualified stock options to purchase number of shares   259,157      
Share-based compensation arrangement by share-based payment award, restricted stock options to purchase number of shares   77,640      
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     2,000,000
Share-based compensation arrangement by share-based payment award, restricted stock options to purchase number of shares   501,029      
Stock options, Granted   0 0 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     $ 0
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%     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%     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%     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%     40.00%
Prior to 2009 Incentive Stock Options [Member] | Long Term Incentive Plan 2005 [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] | Long Term Incentive Plan 2005 [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      
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      
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     25,000
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     200,000
Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost related to non-vested awards   $ 1,900,000     $ 1,900,000
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Not Yet Recognized Next Twelve Months   300,000     300,000
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Expected to Recognize During Remainder of Year Two   200,000     200,000
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Expected to Recognize During Remainder of Year Three   100,000     $ 100,000
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Expected to Recognized   600,000      
Allocated share-based compensation expense   149,000   $ 226,000  
Allocated share based compensation benefit     $ (156,000)    
Income tax benefit of share-based payments recognized in income   $ 52,000   $ 79,000  
Income tax expense of share-based payments recognized in income     $ 55,000    
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 granted, weighted average grant date fair value   $ 11.10 $ 11.41 $ 10.20