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Leases - Total lease cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2021	Jun. 25, 2020	Jul. 01, 2021	Jun. 25, 2020
Finance lease costs:
Amortization of finance lease assets	$ 668	$ 719	$ 1,380	$ 1,430
Interest on lease liabilities	240	262	490	531
Total finance lease costs	908	981	1,870	1,961
Operating lease costs:
Operating lease costs	6,465	6,212	12,786	12,879
Variable lease cost	(158)	20	(173)	247
Short-term lease cost	37	96	72	156
Total operating lease costs	$ 6,344	$ 6,328	$ 12,685	$ 13,282

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Amount of finance lease cost recognized by lessee for lease contract.

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- Definition

Amount of interest expense on finance lease liability.

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Amount of amortization expense attributable to right-of-use asset from finance lease.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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