Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2020	Jun. 29, 2019	Jul. 04, 2020	Jun. 29, 2019	Dec. 31, 2019
Assets and Liabilities [Abstract]
Right of use assets	$ 103,153		$ 103,153		$ 93,162
Current lease liabilities	21,443		21,443		20,217
Long-term lease liabilities	85,714		85,714		78,511
Total lease liabilities	107,157		107,157		98,728
Lease expense [Abstract]
Operating lease expense	5,760	$ 5,627	11,412	$ 11,163
Short-term lease expense	225	819	419	1,652
Variable lease expense	6	9	29	21
Total lease expense	$ 5,991	$ 6,455	11,860	12,836
Cash paid for operating leases			$ 12,867	$ 10,277
Weighted-average remaining lease term - operating leases	9 years 2 months 12 days		9 years 2 months 12 days
Weighted-average discount rate - operating leases	6.00%		6.00%
Undiscounted future lease payments for operating lease liabilities [Abstract]
2020	$ 11,165		$ 11,165
2021	20,498		20,498
2022	16,838		16,838
2023	14,370		14,370
2024	13,218		13,218
Thereafter	63,394		63,394
Building and Improvements [Member]
Assets and Liabilities [Abstract]
Right of use assets	98,048		98,048		87,689
Current lease liabilities	18,716		18,716		17,410
Long-term lease liabilities	83,372		83,372		75,877
Machinery and Equipment [Member]
Assets and Liabilities [Abstract]
Right of use assets	5,105		5,105		5,473
Current lease liabilities	2,727		2,727		2,807
Long-term lease liabilities	$ 2,342		$ 2,342		$ 2,634