Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jul. 02, 2019	Jun. 30, 2020	Jul. 02, 2019
Leases
Operating	$ 32,915	$ 25,842	$ 65,955	$ 51,604
Variable	11,160	16,426	26,988	32,761
Short-term	123	76	253	153
Total	$ 44,198	$ 42,344	93,196	84,518
Lessee Operating Lease Description
Operating cash flows from operating leases			57,775	48,634
Right-of-use assets obtained in exchange for new operating lease liabilities			$ 32,329	$ 8,580