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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Cash flows from operating activities:    
Net income (loss) $ 22,782 $ (158,662)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 13,979 16,350
Goodwill and intangible asset impairment charge 0 175,189
Provision for credit losses 2,094 5,923
Stock-based compensation 6,916 4,345
Deferred income taxes 652 (27,049)
Non-cash lease expense 7,853 7,454
Other operating activities (1,473) 2,669
Changes in operating assets and liabilities:    
Accounts receivable (16,486) 111,803
Income tax receivable 1,103 (7,291)
Operating lease right-of-use asset 6,135 0
Other assets (2,495) 4,682
Accounts payable and other accrued expenses (6,952) (22,197)
Other accrued wages and benefits 11,208 (10,809)
Deferred employer payroll taxes 2,810 15,730
Workers’ compensation claims reserve (598) (5,668)
Operating lease liabilities (6,729) (7,643)
Other liabilities 6,563 (1,344)
Net cash provided by operating activities 47,362 103,482
Cash flows from investing activities:    
Capital expenditures (19,868) (11,641)
Purchases of restricted available-for-sale investments (14) (1,739)
Sales of restricted available-for-sale investments 452 2,581
Purchases of restricted held-to-maturity investments 0 (11,458)
Maturities of restricted held-to-maturity investments 15,143 16,190
Net cash used in investing activities (4,287) (6,067)
Cash flows from financing activities:    
Purchases and retirement of common stock 0 (52,346)
Net proceeds from employee stock purchase plans 538 536
Common stock repurchases for taxes upon vesting of restricted stock (2,686) (1,956)
Net change in revolving credit facility 0 7,900
Other (188) (1,344)
Net cash used in financing activities (2,336) (47,210)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 319 (736)
Net change in cash, cash equivalents and restricted cash 41,058 49,469
Cash, cash equivalents and restricted cash, beginning of period 118,612 92,371
Cash, cash equivalents and restricted cash, end of period 159,670 141,840
Supplemental Disclosure of Cash Flow Information [Abstract]    
Interest 880 2,402
Income taxes 1,943 (3,707)
Operating lease liabilities 8,335 8,841
Property and equipment purchased but not yet paid 1,968 1,189
Right-of-use assets obtained in exchange for new operating lease liabilities $ 3,162 $ 4,841