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Current and Long-Term Debt - 2018 Redemption (Details) - USD ($)
12 Months Ended
Jun. 29, 2020
Dec. 19, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Long-Term Debt          
Write-off of unamortized deferred financing costs $ 1,200,000 $ 1,400,000      
Redemption cost for early extinguishment of debt   6,400,000 $ 3,018,000 $ 0 $ 6,408,000
Senior Notes, Due 2022          
Long-Term Debt          
Aggregate principle amount   $ 250,000,000.0      
Interest rate   5.125%