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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Dec. 30, 2018
Cash flows from operating activities:      
Net income (loss) $ (141,841) $ 63,073 $ 65,754
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 32,031 37,549 41,049
Goodwill and intangible asset impairment charge 175,189 0 0
Provision for doubtful accounts 6,300 7,661 10,042
Stock-based compensation 9,113 9,769 13,876
Deferred income taxes (26,791) 1,263 (1,929)
Non-cash lease expense 15,195 14,823 0
Other operating activities (686) (1,589) 5,154
Changes in operating assets and liabilities, net of amounts acquired and divested:      
Accounts receivable 57,146 5,450 11,640
Income tax receivable (1,122) (6,480) (996)
Other assets (2,124) (12,575) (12,928)
Accounts payable and other accrued expenses (6,561) 6,921 3,029
Accrued wages and benefits 55,053 (9,494) (1,613)
Workers’ compensation claims reserve (125) (10,828) (7,877)
Operating lease liabilities (14,562) (15,178) 0
Other liabilities (3,684) 3,166 491
Net cash provided by operating activities 152,531 93,531 125,692
Cash flows from investing activities:      
Capital expenditures (27,066) (28,119) (17,054)
Acquisition of businesses, net of cash acquired 0 0 (22,742)
Divestiture of business 0 215 10,587
Payments for company-owned life insurance (12,031) (12,210) 0
Purchases of restricted available-for-sale investments (2,896) (7,667) (6,173)
Sales of restricted available-for-sale investments 12,311 20,859 1,991
Purchases of restricted held-to-maturity investments (32,495) (22,963) (6,768)
Maturities of restricted held-to-maturity investments 27,561 28,254 19,644
Other 205 0 0
Net cash used in investing activities (34,411) (21,631) (20,515)
Cash flows from financing activities:      
Purchases and retirement of common stock (52,346) (38,826) (34,818)
Net proceeds from employee stock purchase plans 922 1,329 1,503
Common stock repurchases for taxes upon vesting of restricted stock (2,438) (2,222) (3,404)
Net change in revolving credit facility (37,100) (42,900) (15,900)
Payments on debt 0 0 (22,397)
Other (1,540) (296) 0
Net cash used in financing activities (92,502) (82,915) (75,016)
Effect of exchange rate changes on cash, cash equivalents and restricted cash 623 936 (1,542)
Net change in cash, cash equivalents and restricted cash 26,241 (10,079) 28,619
Cash, cash equivalents and restricted cash, beginning of period 92,371 102,450 73,831
Cash, cash equivalents and restricted cash, end of period 118,612 92,371 102,450
Supplemental disclosure of cash flow information:      
Interest 3,149 2,432 4,373
Income taxes (3,441) 12,166 12,898
Operating lease liabilities 16,995 17,643 0
Non-cash transactions:      
Property and equipment purchased but not yet paid 1,347 993 1,553
Divestiture non-cash consideration 0 0 798
Right-of-use assets obtained in exchange for new operating lease liabilities $ 38,847 $ 18,759 $ 0