Leases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 28, 2019	Sep. 28, 2019	Dec. 31, 2018
Assets and Liabilities [Abstract]
Right of use assets	$ 93,103	$ 93,103	$ 0
Current lease liabilities	16,932	16,932	0
Long-term lease liabilities	80,998	80,998	0
Total lease liabilities	97,930	97,930
Lease expense [Abstract]
Operating lease expense	5,557	16,720
Short-term lease expense	361	2,013
Variable lease expense	9	30
Total lease expense	$ 5,927	18,763
Cash paid for operating leases		$ 16,023
Weighted-average remaining lease term - operating leases	9 years	9 years
Weighted-average discount rate - operating leases	6.10%	6.10%
Undiscounted future lease payments for operating lease liabilities [Abstract]
2019 (excluding the nine fiscal months ended September 28, 2019)	$ 5,504	$ 5,504
2020	19,629	19,629
2021	16,949	16,949
2022	13,633	13,633
2023	12,463	12,463
Thereafter	61,261	61,261
ASU 2016-02 [Member]
Assets and Liabilities [Abstract]
Right of use assets			91,462
Current lease liabilities			13,961
Long-term lease liabilities			81,823
Total lease liabilities			95,784
Building and Improvements [Member]
Assets and Liabilities [Abstract]
Right of use assets	88,060	88,060
Current lease liabilities	14,398	14,398
Long-term lease liabilities	78,519	78,519
Building and Improvements [Member] | ASU 2016-02 [Member]
Assets and Liabilities [Abstract]
Right of use assets			86,058
Current lease liabilities			10,644
Long-term lease liabilities			79,000
Machinery and Equipment [Member]
Assets and Liabilities [Abstract]
Right of use assets	5,043	5,043
Current lease liabilities	2,534	2,534
Long-term lease liabilities	$ 2,479	$ 2,479
Machinery and Equipment [Member] | ASU 2016-02 [Member]
Assets and Liabilities [Abstract]
Right of use assets			5,404
Current lease liabilities			3,317
Long-term lease liabilities			$ 2,823