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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Remaining requisite service period 26 months    
Unearned compensation $ 1,218    
Time-Vested Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unearned compensation related to options $ 1,277    
Remaining service period 33 months    
Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Period 3 years    
Award contractual term 10 years    
Stock-based compensation $ 2,553 $ 20  
Estimated fair value $ 12,656    
Granted (shares) 1,735,500    
30 day trailing average fair market value, per share $ 3.17    
Exercise price 2.38    
Stock awards, Grants in Period, Weighted Average Grant Date Fair Value $ 1.74    
Stock Appreciation Rights (SARs) [Member] | Share-based Payment Arrangement, Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting percentage 133.30%    
Including Liability Based Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 2,662 $ 227  
Certain Employees [Member] | Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted     1,139,464