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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Oct. 01, 2017
Sep. 23, 2016
Cash flows from operating activities:    
Net income (loss) $ 39,029 $ (33,338)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 34,650 34,673
Goodwill and intangible asset impairment charge 0 103,544
Provision for doubtful accounts 6,321 6,361
Stock-based compensation 6,161 7,443
Deferred income taxes 4,890 (23,874)
Other operating activities 2,563 5,603
Changes in operating assets and liabilities, net of effects of acquisition of business:    
Accounts receivable (34,198) 102,722
Income tax receivable 12,788 4,018
Other assets 6,306 (3,563)
Accounts payable and other accrued expenses (784) (3,764)
Accrued wages and benefits (176) (3,254)
Workers’ compensation claims reserve 1,985 11,938
Other liabilities 1,086 4,740
Net cash provided by operating activities 80,621 213,249
Cash flows from investing activities:    
Capital expenditures (16,303) (17,766)
Acquisition of business 0 (71,863)
Change in restricted cash and cash equivalents 8,623 732
Purchases of restricted investments (36,015) (35,940)
Maturities of restricted investments 15,042 12,273
Net cash used in investing activities (28,653) (112,564)
Cash flows from financing activities:    
Payments for Repurchase of Common Stock (29,371) 0
Net proceeds from stock option exercises and employee stock purchase plans 1,179 1,183
Common stock repurchases for taxes upon vesting of restricted stock (2,956) (2,692)
Net change in Revolving Credit Facility (1,099) (104,586)
Payments on debt (1,700) (1,700)
Payment of contingent consideration at acquisition date fair value (18,300) 0
Other 0 20
Net cash used in financing activities (52,247) (107,775)
Effect of exchange rate changes on cash and cash equivalents 364 2,090
Net change in cash and cash equivalents 85 (5,000)
Cash and cash equivalents, beginning of period 34,970 29,781
Cash and cash equivalents, end of period 35,055 24,781
Supplemental Cash Flow Information [Abstract]    
Interest 2,612 3,071
Income taxes (2,972) 8,801
Property, plant, and equipment purchased but not yet paid 2,863 2,244
Non-cash acquisition adjustments $ 0 $ 3,783