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Long-Term Debt And Other Long-Term Liabilities (Long-Term Debt) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Long-term debt:    
Long-term debt $ 3,100 $ 98,400
Exit Credit Agreement    
Debt Instrument [Line Items]    
Revolving credit facility interest rate   6.60%
Exit Credit Agreement | Current portion of long-term debt    
Current portion of long-term debt:    
Line of Credit, Current 0 $ 600
Exit Credit Agreement | Long-term Debt    
Long-term debt:    
Long-term debt $ 0 98,400
Superior Credit Agreement    
Debt Instrument [Line Items]    
Revolving credit facility interest rate 2.10%  
Superior Credit Agreement | Long-term Debt    
Long-term debt:    
Long-term debt $ 3,100  
Long-term Line of Credit $ 3,100 $ 0