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Debt And Other Financing (Annual Maturities Of Long-term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt And Other Financing [Abstract]    
2021 $ 9,116  
2022 9,095  
2023 8,957  
2024 773,652  
2025 691  
Thereafter 3,309  
Total maturities of long-term debt 804,820  
Unamortized issuance costs on Term loan facility (3,719)  
Imputed interest and executory costs on capitalized lease obligations (753)  
Total long-term debt $ 800,348 $ 807,565