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Share-Based Payment Arrangements (Narrative) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
item
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
$ / shares
Dec. 31, 2017
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options, Granted | shares 0 0    
Long Term Incentive Plan 2005 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of incentive stock options outstanding | shares 0      
Share-based compensation arrangement by share-based payment award, non-qualified stock options to purchase number of shares | shares 14,157      
Long Term Incentive Plan 2015 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of incentive stock options outstanding | shares 0      
Share-based compensation arrangement by share-based payment award, number of shares authorized | shares 2,000,000      
Share-based compensation arrangement by share-based payment award, restricted stock options to purchase number of shares | shares 530,236      
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 share-based compensation arrangements | $ $ 0      
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 payment, award vesting period 6 months      
Non Qualified Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | First Seven Anniversary Dates [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of anniversary dates | item 7      
Non Qualified Stock Options [Member] | Long Term Incentive Plan 2005 [Member] | Two Hundred Thousand Grant [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of options vested or expected to vest | shares 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 share-based compensation arrangements | $ $ 1,000      
Allocated share-based compensation expense (benefit) | $ (400) $ 887    
Income tax benefit (expense) of share-based payments recognized in income | $ (84) $ 186    
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Expected to Recognized | $ 300      
2021 | $ 200      
2022 | $ $ 100      
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 2015 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Other than options, grant date fair value | $ / shares   $ 18.10 $ 10.87 $ 10.20