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Long-Term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Less unamortized issuance costs $ (4,146) $ (1,716)
Total 220,707 194,872
Less current maturities   (971)
Long-term debt 220,707 193,901
Revolving Credit Loan [Member] | Senior Secured Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt gross $ 224,853 178,458
Term Loan [Member] | Senior Secured Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt gross   $ 18,130