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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
8 Months Ended 12 Months Ended
Aug. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Sep. 03, 2020
May 06, 2015
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum number of shares of common stock allowed for the issuance       903,226 7,230,000
Vesting Period   3 years      
Grant date fair value     $ 22,600    
Directors Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Director option awards 3,500        
Incentive Stock Grants          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum number of shares of common stock allowed for the issuance         2,000,000.0
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Reversal of previously recorded expense for unvested awards $ (2,200)