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Lessee ROU Assets and Lease Liabilities Lease, Cost (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Leases [Abstract]        
Operating lease costs $ 1,732,000 $ 1,688,000 $ 3,390,000 $ 3,453,000
Short-term lease costs 0 3,000 1,000 12,000
Sublease income 0 (52,000) 0 (104,000)
Total lease costs $ 1,732,000 $ 1,639,000 $ 3,391,000 $ 3,361,000