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Lessee ROU Assets and Lease Liabilities Lease, Cost (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Leases [Abstract]        
Operating lease costs $ 1,776,000 $ 1,717,000 $ 5,188,000 $ 5,170,000
Short-term lease costs 0 0 1,000 12,000
Sublease income 0 (52,000) 0 (156,000)
Total lease costs $ 1,776,000 $ 1,665,000 $ 5,189,000 $ 5,026,000