Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 24, 2020
OPERATING ACTIVITIES:
Net loss	$ (49,737)	$ (85,844)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Losses on investments in joint ventures		1,539
(Gain) loss on disposition of property, equipment and other assets	(2,908)	299
Impairment charges	3,732	9,477
Depreciation and amortization	54,203	56,568
Amortization of debt issuance costs and discount on convertible notes	1,784	697
Share-based compensation	6,673	3,286
Deferred income taxes	(18,817)	(2,787)
Other long-term obligations	2,236	3,938
Contribution of the Company's stock to savings and profit-sharing plan	1,012	1,315
Changes in operating assets and liabilities:
Accounts receivable	(12,052)	22,558
Government grants receivable	4,913
Other assets	(1,552)	1,604
Operating leases	(4,078)	8,519
Accounts payable	7,155	(31,852)
Income taxes	7,613	(48,518)
Taxes other than income taxes	(1,031)	(3,975)
Accrued compensation	5,703	(7,259)
Other accrued liabilities	(2,792)	(10,214)
Total adjustments	51,794	5,195
Net cash provided by (used in) operating activities	2,057	(80,649)
INVESTING ACTIVITIES:
Capital expenditures	(9,121)	(18,687)
Proceeds from disposals of property, equipment and other assets	9,160	1,602
Capital contribution in joint venture		(28)
Proceeds from sale of trading securities		5,184
Purchase of trading securities	(2,402)
Life insurance premium reimbursement	11,411
Other investing activities	200	220
Net cash provided by (used in) investing activities	9,248	(11,709)
Debt transactions:
Proceeds from borrowings on revolving credit facility	128,500	209,000
Repayment of borrowings on revolving credit facility	(95,500)	(280,000)
Proceeds from short-term borrowings		90,800
Repayments on short-term borrowings	(37,845)
Proceeds from convertible senior notes		100,050
Principal payments on long-term debt	(10,285)	(9,356)
Proceeds received from PPP loans expected to be repaid		3,147
Proceeds received from borrowing on insurance policy	6,700
Debt issuance costs	(208)	(6,543)
Principal payments on finance lease obligations	(2,065)	(1,389)
Equity transactions:
Treasury stock transactions, except for stock options	(1,170)	(542)
Exercise of stock options	1,455	379
Capped call transactions		(16,908)
Dividends paid		(5,145)
Net cash provided by (used in) financing activities	(10,418)	83,493
Net increase (decrease) in cash, cash equivalents and restricted cash	887	(8,865)
Cash, cash equivalents and restricted cash at beginning of period	14,088	25,618
Cash, cash equivalents and restricted cash at end of period	14,975	16,753
Supplemental Information:
Interest paid, net of amounts capitalized	12,932	9,313
Income taxes paid (refunded)	(7,733)	322
Change in accounts payable for additions to property, equipment and other assets	$ 828	$ (2,640)