Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Oct. 03, 2020	Sep. 28, 2019	Dec. 31, 2019
Assets and Liabilities [Abstract]
Right of use assets	$ 103,235		$ 103,235		$ 93,162
Current lease liabilities	21,924		21,924		20,217
Long-term lease liabilities	86,043		86,043		78,511
Total lease liabilities	107,967		107,967		98,728
Lease expense [Abstract]
Operating lease expense	5,898	$ 5,557	17,310	$ 16,720
Short-term lease expense	260	361	679	2,013
Variable lease expense	11	9	40	30
Total lease expense	$ 6,169	$ 5,927	18,029	18,763
Cash paid for operating leases			$ 18,703	$ 16,023
Weighted-average remaining lease term - operating leases	8 years 10 months 24 days		8 years 10 months 24 days
Weighted-average discount rate - operating leases	5.90%		5.90%
Undiscounted future lease payments for operating lease liabilities [Abstract]
2020	$ 5,770		$ 5,770
2021	21,720		21,720
2022	18,320		18,320
2023	15,020		15,020
2024	13,728		13,728
Thereafter	65,738		65,738
Building and Improvements [Member]
Assets and Liabilities [Abstract]
Right of use assets	98,227		98,227		87,689
Current lease liabilities	19,237		19,237		17,410
Long-term lease liabilities	83,742		83,742		75,877
Machinery and Equipment [Member]
Assets and Liabilities [Abstract]
Right of use assets	5,008		5,008		5,473
Current lease liabilities	2,687		2,687		2,807
Long-term lease liabilities	$ 2,301		$ 2,301		$ 2,634