Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 25, 2021	Sep. 26, 2020
Cash flows provided by operating activities:
Net income	$ 66,338	$ 159,143
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	52,953	48,937
Impairment of assets	15,389	2,796
Gain on disposal of property, plant and equipment	(202)	(173)
Change in right-of-use assets	5,959	5,465
Other non-cash (income) expense	(92)	746
Stock-based compensation expense	14,002	10,735
Deferred income taxes	(9,370)	14,160
Changes in operating assets and liabilities:
Accounts receivable	(5,184)	(39,775)
Inventories	(71,104)	(23,072)
Prepaid expenses, income tax receivable and other current assets	(39,239)	43
Third-party production prepayments	(2,733)	(21,397)
Other assets	(5,682)	(516)
Accounts payable	17,781	33,020
Accrued expenses and other current liabilities	18,127	18,024
Change in operating lease liabilities	(6,102)	(1,887)
Other liabilities	124	2,671
Net cash provided by operating activities	50,965	208,920
Cash flows used in investing activities:
Purchases of property, plant and equipment	(120,887)	(100,341)
Proceeds from disposal of property, plant and equipment	1,142	72
Other investing activities	145	392
Net cash used in investing activities	(119,600)	(99,877)
Cash flows (used in) provided by financing activities:
Proceeds from exercise of stock options and sale of investment shares	8,571	14,015
Net cash paid on note payable and finance leases	(1,181)	(906)
Cash borrowed on line of credit		100,000
Cash paid on line of credit		(100,000)
Payment of tax withholding on stock-based payment awards and investment shares	(15,533)	(1,692)
Net cash (used in) provided by financing activities	(8,143)	11,417
Change in cash and cash equivalents	(76,778)	120,460
Cash and cash equivalents at beginning of year	163,282	36,670
Cash and cash equivalents at end of period	86,504	157,130
Supplemental disclosure of cash flow information:
Income taxes paid	53,712	17,309
Cash paid for amounts included in measurement of lease liabilities
Operating cash flows from operating leases	7,823	6,949
Operating cash flows from finance leases	95	106
Financing cash flows from finance leases	1,110	838
Right-of-use-assets obtained in exchange for operating lease obligations	1,961	11,698
Right-of-use-assets obtained in exchange for finance lease obligations	472	2,689
Change in purchase of property, plant and equipment in accounts payable and accrued expenses	$ (10,489)	$ (3,390)