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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2018
Apr. 02, 2017
Cash flows from operating activities:    
Net income $ 8,755 $ 4,674
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 10,090 11,174
Provision for doubtful accounts 2,209 1,446
Stock-based compensation 3,409 3,304
Deferred income taxes 1,370 726
Other operating activities (572) 1,080
Changes in operating assets and liabilities:    
Accounts receivable 42,679 49,077
Income tax receivable (2,842) 9,565
Other assets (1,964) 3,627
Accounts payable and other accrued expenses (4,878) (15,015)
Accrued wages and benefits (9,991) (16,071)
Workers’ compensation claims reserve (4,579) (1,957)
Other liabilities 1,149 2,488
Net cash provided by operating activities 44,835 54,118
Cash flows from investing activities:    
Capital expenditures (1,911) (6,167)
Divestiture of business 8,500 0
Purchases of restricted investments (3,299) (14,975)
Maturities of restricted investments 6,417 4,423
Net cash provided by (used in) investing activities 9,707 (16,719)
Cash flows from financing activities:    
Net proceeds from stock option exercises and employee stock purchase plans 395 491
Common stock repurchases for taxes upon vesting of restricted stock (2,086) (2,400)
Net change in Revolving Credit Facility (46,301) (57,367)
Payments on debt (567) (567)
Net cash used in financing activities (48,559) (59,843)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (760) (339)
Net change in cash, cash equivalents and restricted cash 5,223 (22,783)
Cash, cash equivalents and restricted cash, beginning of period 73,831 103,222
Cash, cash equivalents and restricted cash, end of period 79,054 80,439
Supplemental Cash Flow Information [Abstract]    
Interest 827 755
Income taxes 2,342 (8,487)
Property, plant, and equipment purchased but not yet paid 581 1,161
Divestiture non-cash consideration $ 1,957 $ 0