Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 29, 2019	Jun. 30, 2018
Cash flows provided by operating activities:
Net income	$ 51,550	$ 32,845
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,089	26,011
Impairment of assets	243	517
Loss on disposal of property, plant and equipment	104	26
Lease expense	1,789
Bad debt (recovery) expense	(1)	27
Stock-based compensation expense	5,810	4,570
Deferred income taxes	6,283	775
Changes in operating assets and liabilities:
Accounts receivable	(35,346)	(21,651)
Inventories	(14,942)	(18,636)
Prepaid expenses, income tax receivable and other assets	(10,962)	217
Accounts payable	26,320	20,563
Accrued expenses and other current liabilities	(101)	8,721
Net lease liabilities	(1,391)
Other liabilities	85	(244)
Net cash provided by operating activities	55,530	53,741
Cash flows used in investing activities:
Purchases of property, plant and equipment	(44,578)	(25,470)
Proceeds from disposal of property, plant and equipment	179	2
Cash paid for merger	(158,402)
Change in restricted cash	(188)	98
Net cash used in investing activities	(202,989)	(25,370)
Cash flows provided by (used in) financing activities:
Repurchase of Class A Common Stock		(39,725)
Proceeds from exercise of stock options	4,146	21,529
Net cash paid on note payable and capital lease	(115)	(78)
Cash borrowed on line of credit	86,000
Cash paid on line of credit	(48,500)
Net proceeds from sale of investment shares	546	445
Net cash provided (used in) by financing activities	42,077	(17,829)
Change in cash and cash equivalents	(105,382)	10,542
Cash and cash equivalents at beginning of year	108,399	65,637
Cash and cash equivalents at end of period	3,017	76,179
Supplemental disclosure of cash flow information:
Income taxes paid	13,697	3,355
Cash paid for amounts included in measurement of lease liabilities	1,976
Right-of-use assets obtained in exchange for operating lease obligations	38,524
Right-of-use assets obtained in exchange for capital lease obligations	2,837
Decrease in accounts receivable for ASU 2014-09 adoption		(1,310)
Increase in accounts payable for purchase of property, plant and equipment	$ 1,484	$ 774