Leases (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 28, 2019	Jun. 28, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Total capacity under master lease agreement	$ 20,000	$ 20,000
Finance Lease, Right-of-use Asset, Gross	7,700	7,700
Accumulated Amortization of Finance Leases	1,900	1,900
Capital Leased Assets, Gross			$ 10,800
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation			1,500
Operating Lease, Right-of-Use Asset	16,330	16,330	0
Finance Lease, Right-of-Use Asset	5,748	5,748
Right-of-use assets, Total	22,078	22,078
Operating Lease, Liability, Current	4,259	4,259	0
Finance Lease, Liability, Current	1,972	1,972	1,803
Operating Lease, Liability, Noncurrent	12,895	12,895	0
Finance Lease, Liability, Noncurrent	6,143	6,143	6,260
Lease liabilities, Total	25,269	25,269	8,063
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	2,560	2,560
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months			4,800
Lessee, Operating Lease, Liability, Payments, Due Year Two	4,783	4,783	4,500
Lessee, Operating Lease, Liability, Payments, Due Year Three	3,847	3,847	3,700
Lessee, Operating Lease, Liability, Payments, Due Year Four	3,100	3,100	3,100
Lessee, Operating Lease, Liability, Payments, Due Year Five	2,609	2,609	2,600
Lessee, Operating Lease, Liability, Payments, Due after Year Five	1,970	1,970	2,000
Lessee, Operating Lease, Liability, Payments, Due	18,869	18,869	20,700
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(1,715)	(1,715)
Operating Lease, Liability	17,154	17,154
Finance Lease, Liability, Payments, Due Remainder of Fiscal Year	1,147	1,147
Finance Lease, Liability, Payments, Due Next Twelve Months			1,800
Finance Lease, Liability, Payments, Due Year Two	2,094	2,094	1,800
Finance Lease, Liability, Payments, Due Year Three	1,963	1,963	1,700
Finance Lease, Liability, Payments, Due Year Four	1,702	1,702	1,500
Finance Lease, Liability, Payments, Due Year Five	1,181	1,181	1,000
Finance Lease, Liability, Payments, Due after Year Five	394	394	300
Finance Lease, Liability, Payments, Due	8,481	8,481	$ 8,100
Finance Lease, Liability, Undiscounted Excess Amount	(366)	(366)
Finance Lease, Liability	8,115	8,115
Finance Lease, Right-of-Use Asset, Amortization	238	465
Finance Lease, Interest Expense	79	153
Operating Lease, Cost	1,279	2,554
Short-term Lease, Cost	3	27
Variable Lease, Cost	33	53
Lease, Cost	$ 1,632	3,252
Operating Lease, Payments		(2,585)
Finance Lease, Interest Payment on Liability		(153)
Finance Lease, Principal Payments		(663)
Lease Payments, Total		3,401
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		$ 200
Operating Lease, Weighted Average Remaining Lease Term	4 years 5 months 8 days	4 years 5 months 8 days
Finance Lease, Weighted Average Remaining Lease Term	3 years 8 months 1 day	3 years 8 months 1 day
Operating Lease, Weighted Average Discount Rate, Percent	4.36%	4.36%
Finance Lease, Weighted Average Discount Rate, Percent	4.00%	4.00%
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability		$ 1,500
Machinery and Equipment [Member]
Lessee, Lease, Description [Line Items]
Lessee, Finance Lease, Term of Contract	5 years	5 years
Maximum | Real Estate [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	7 years	7 years
Maximum | Machinery and Equipment [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	5 years	5 years
Minimum | Real Estate [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	3 years	3 years
Minimum | Machinery and Equipment [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	3 years	3 years
Finance Lease [Member] | Asset under Construction [Member]
Lessee, Lease, Description [Line Items]
Property, Plant and Equipment, Gross	$ 3,200	$ 3,200