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Income Taxes, CARES Act (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
CARES Act [Abstract]    
Tax bonus depreciation percentage   100.00%
Decrease in income tax liability   $ (2,053)
Selling, General and Administrative Expenses [Member]    
CARES Act [Abstract]    
Refundable employee retention credits $ 2,301  
Accrued Liabilities [Member]    
CARES Act [Abstract]    
Deferred employer-paid portion of social security taxes $ 1,607