Commitments and Contingencies (Lease Commitments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2020	Dec. 27, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating Lease, Right-of-Use Asset	$ 37,807	$ 29,891
Operating Lease, Weighted Average Remaining Lease Term	6 years 3 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	3.10%
Operating Lease, Expense	$ 11,100
Operating Lease, Payments	11,200
Operating Lease, Right of Use Asset, Additions	13,200
Lessee, Operating Lease, Liability, Payments, Due in 2021	9,418
Lessee, Operating Lease, Liability, Payments, Due in 2022	8,369
Lessee, Operating Lease, Liability, Payments, Due in 2023	5,719
Lessee, Operating Lease, Liability, Payments, Due in 2024	4,691
Lessee, Operating Lease, Liability, Payments, Due in 2025	4,142
Lessee, Operating Lease, Liability, Payments, Due Thereafter	12,388
Lessee, Operating Lease, Liability, Payments, Due	44,727
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(4,325)
Operating Lease, Liability	$ 40,402