Leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 29, 2020	Oct. 01, 2019	Sep. 29, 2020	Oct. 01, 2019
Leases
Operating	$ 31,267	$ 26,270	$ 97,222	$ 77,875
Variable	15,304	15,768	42,292	48,529
Short-term	93	81	346	234
Total	$ 46,664	$ 42,119	139,860	126,638
Lessee Operating Lease Description
Operating cash flows from operating leases			85,076	73,163
Right-of-use assets obtained in exchange for new operating lease liabilities			$ 46,068	$ 35,271

Amount of lease cost recognized by lessee for lease contract.

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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.

+ References

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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Amount of short-term lease cost, excluding expense for lease with term of one month or less.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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