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Long-Term Debt And Other Long-Term Liabilities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 03, 2020
Mar. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Long-term debt   $ 78,200 $ 98,400
Exit Credit Agreement      
Debt Instrument [Line Items]      
Current ratio of credit facility 1.00    
Interest Coverage Ratio 2.50    
Exit Credit Agreement | Long-term Debt      
Debt Instrument [Line Items]      
Long-term debt   78,200 $ 98,400
Exit Credit Agreement | September 1, 2020 to March 31, 2021 [Member]      
Debt Instrument [Line Items]      
Net leverage ratio 4.00    
Exit Credit Agreement | April 1, 2021 to June 30, 2022 [Member]      
Debt Instrument [Line Items]      
Net leverage ratio 3.75    
Exit Credit Agreement | July 1, 2022 to September 30, 2022 [Member]      
Debt Instrument [Line Items]      
Net leverage ratio 3.50    
Exit Credit Agreement | Revolving Credit Facility [Member] | Eurodollar [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 5.25%    
Exit Credit Agreement | Revolving Credit Facility [Member] | Alternate Base Rate [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 4.25%    
Exit Credit Agreement | Term loan [Member] | Eurodollar [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 6.25%    
Exit Credit Agreement | Term loan [Member] | Alternate Base Rate [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 5.25%    
Exit Credit Agreement | Secured Debt [Member]      
Debt Instrument [Line Items]      
Debt instrument maturity date Mar. 01, 2024    
Exit Credit Agreement | Secured Debt [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Credit facility maximum credit amount $ 140,000    
Exit Credit Agreement | Secured Debt [Member] | Term loan [Member]      
Debt Instrument [Line Items]      
Credit facility maximum credit amount $ 40,000    
Superior Credit Agreement [Member]      
Debt Instrument [Line Items]      
Credit facility maximum credit amount   $ 250,000  
Superior Credit Agreement, Term   5 years  
Credit facility current credit amount   $ 200,000  
Superior Credit Agreement, Interest Rate Description   annual interest at a rate, at Superior’s option, equal to (a) LIBOR plus the applicable margin of 2.00% to 3.25% or (b) the alternate base rate (greater of (i) the federal funds rate plus 0.5%, (ii) the prime rate, and (iii) the Thirty-Day LIBOR Rate (as defined in the Superior credit agreement)) plus the applicable margin of 1.00% to 2.25%.  
Commitment fee percentage under credit facility   0.375%  
Origination, agency and syndication and other related fees with the credit agreement   $ 1,700  
Superior Credit Agreement [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Consolidated EBITDA to interest expense ratio   2.50 to 1.00  
Superior Credit Agreement [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Funded debt to consolidated EBITDA ratio   4.00 to 1.00