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Interest Rate Swaps - Pre-Tax Gains and Losses Derived from Interest Rate Swaps (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 25, 2021
Sep. 26, 2020
Sep. 25, 2021
Sep. 26, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Amount of gains/(losses) recognized in OCI during the period $ 278 $ 629 $ 3,569 $ (8,153)