Leases (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Apr. 02, 2019
Leases
Operating	$ 33,041	$ 26,427
Variable	15,828	16,335
Short-term	129	77
Total	48,998	42,839
Lessee Operating Lease Description
Cash paid for amounts included in the measurement of lease liabilities-Operating cash flows from operating leases	30,760	24,213
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 14,929	$ 5,768

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.

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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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