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Interest Rate Swaps Current Period OCI Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 28, 2020
Mar. 30, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax $ (7,056) $ (1,947)