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Share-Based Payment Arrangements (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2020
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 outstanding 0          
Share-based compensation arrangement by share-based payment award, non-qualified stock options to purchase number of shares 14,157          
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 103,575          
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 share-based compensation arrangements $ 0         $ 0
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 500          
Allocated share-based compensation expense (benefit) 97 $ (581)        
Income tax benefit (expense) of share-based payments recognized in income 20 $ (122)        
Employee Service Share-based Compensation Nonvested Awards, Total Compensation Cost Expected to Recognized 200          
Remainder of 2021 100          
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     $ 18.10 $ 10.87 $ 10.20