Leases (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 29, 2019	Jun. 29, 2019	Dec. 31, 2018
Assets and Liabilities [Abstract]
Right of use assets	$ 96,136	$ 96,136	$ 0
Current lease liabilities	15,323	15,323	0
Long-term lease liabilities	86,086	86,086	0
Total lease liabilities	101,409	101,409
Lease expense [Abstract]
Operating lease expense	5,627	11,163
Short-term lease expense	819	1,652
Variable lease expense	9	21
Total lease expense	$ 6,455	12,836
Cash paid for operating leases		$ 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	6.10%	6.10%
Undiscounted future lease payments for operating lease liabilities [Abstract]
2019 (excluding the six fiscal months ended June 29, 2019)	$ 11,095	$ 11,095
2020	19,294	19,294
2021	16,198	16,198
2022	13,408	13,408
2023	12,387	12,387
Thereafter	61,246	61,246
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	90,989	90,989
Current lease liabilities	12,676	12,676
Long-term lease liabilities	83,604	83,604
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	5,147	5,147
Current lease liabilities	2,647	2,647
Long-term lease liabilities	$ 2,482	$ 2,482
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