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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 27, 2020
Sep. 29, 2019
Cash flows from operating activities:    
Net income (loss) $ (149,867) $ 54,358
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 24,002 28,528
Goodwill and intangible asset impairment charge 175,189 0
Provision for doubtful accounts 6,582 5,997
Stock-based compensation 6,762 8,119
Deferred income taxes (25,955) 1,058
Non-cash lease expense 11,115 11,087
Other operating activities 1,944 (1,701)
Changes in operating assets and liabilities:    
Accounts receivable 55,408 (17,616)
Income tax receivable (4,928) (3,982)
Other assets (2,646) (9,449)
Accounts payable and other accrued expenses (12,723) (6,970)
Accrued wages and benefits (7,395) (141)
Workers’ compensation claims reserve (824) (7,176)
Operating lease liabilities (11,410) (11,297)
Deferred employer payroll taxes 36,312 0
Other liabilities (2,798) 1,723
Net cash provided by operating activities 98,768 52,538
Cash flows from investing activities:    
Capital expenditures (16,244) (18,297)
Divestiture of business 0 215
Purchases of restricted available-for-sale investments (2,310) (5,299)
Sales of restricted available-for-sale investments 3,212 3,881
Purchases of restricted held-to-maturity investments (32,495) (17,298)
Maturities of restricted held-to-maturity investments 24,358 25,095
Net cash used in investing activities (23,479) (11,703)
Cash flows from financing activities:    
Purchases and retirement of common stock (52,346) (31,316)
Net proceeds from employee stock purchase plans 734 1,023
Common stock repurchases for taxes upon vesting of restricted stock (2,331) (1,934)
Net change in revolving credit facility (35,600) (36,200)
Other (1,436) (203)
Net cash used in financing activities (90,979) (68,630)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (466) 732
Net change in cash, cash equivalents and restricted cash (16,156) (27,063)
Cash, cash equivalents and restricted cash, beginning of period 92,371 102,450
Cash, cash equivalents and restricted cash, end of period 76,215 75,387
Supplemental Disclosure of Cash Flow Information [Abstract]    
Interest 2,672 1,767
Income taxes (3,414) 9,230
Operating lease liabilities 13,147 13,280
Property and equipment purchased but not yet paid 1,614 945
Right-of-use assets obtained in exchange for new operating lease liabilities $ 8,672 $ 10,825