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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net income (loss) $ (158,662) $ 27,682
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 16,350 19,779
Goodwill and intangible asset impairment charge 175,189 0
Provision for doubtful accounts 5,923 3,761
Stock-based compensation 4,345 5,260
Deferred income taxes (27,049) 2,393
Non-cash lease expense 7,454 6,934
Other operating activities 2,669 (2,072)
Changes in operating assets and liabilities:    
Accounts receivable 111,803 16,162
Income tax receivable (7,291) (6,347)
Other assets 4,682 (4,472)
Accounts payable and other accrued expenses (22,197) (16,542)
Accrued wages and benefits 4,921 (4,667)
Workers’ compensation claims reserve (5,668) (7,109)
Operating lease liabilities (7,643) (6,957)
Other liabilities (1,344) 3,174
Net cash provided by operating activities 103,482 36,979
Cash flows from investing activities:    
Capital expenditures (11,641) (11,064)
Purchases of restricted available-for-sale investments (1,739) (4,295)
Sales of restricted available-for-sale investments 2,581 2,435
Purchases of restricted held-to-maturity investments (11,458) (7,020)
Maturities of restricted held-to-maturity investments 16,190 17,250
Net cash used in investing activities (6,067) (2,694)
Cash flows from financing activities:    
Purchases and retirement of common stock (52,346) (9,077)
Net proceeds from employee stock purchase plans 536 700
Common stock repurchases for taxes upon vesting of restricted stock (1,956) (1,631)
Net change in Revolving Credit Facility 7,900 (55,300)
Other (1,344) (119)
Net cash used in financing activities (47,210) (65,427)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (736) 560
Net change in cash, cash equivalents and restricted cash 49,469 (30,582)
Cash, cash equivalents and restricted cash, beginning of period 92,371 102,450
Cash, cash equivalents and restricted cash, end of period 141,840 71,868
Supplemental Disclosure of Cash Flow Information [Abstract]    
Interest 2,402 1,199
Income taxes (3,707) 7,277
Operating lease liabilities 8,841 8,798
Property and equipment purchased but not yet paid 1,189 1,227
Right-of-use assets obtained in exchange for new operating lease liabilities $ 4,841 $ 7,711