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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 02, 2019
Mar. 31, 2021
Mar. 31, 2020
May 15, 2018
The 2018 Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares authorized       250,000
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted 24,500      
Shares forfeited   0    
Vested period   3 years    
Shares issued   0    
Stock based compensation expense   $ 27,000 $ 27,000  
Unrecognized stock based compensation expense   $ 80,000    
Unrecognized expense period   9 months    
Year One [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of shares vested   33.30%