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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 25, 2016
Mar. 27, 2015
Cash flows from operating activities:    
Net income $ 6,968 $ 5,716
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 11,289 10,520
Provision for doubtful accounts 1,308 1,745
Stock-based compensation 3,179 3,389
Deferred income taxes (1,083) (299)
Other operating activities 1,014 (316)
Changes in operating assets and liabilities:    
Accounts receivable 147,067 67,411
Income tax receivable 14,742 943
Other assets (3,668) 4,496
Accounts payable and other accrued expenses (9,681) 4,369
Accrued wages and benefits (16,153) (3,999)
Workers’ compensation claims reserve 3,731 159
Other liabilities 1,792 1,626
Net cash provided by operating activities 160,505 95,760
Cash flows from investing activities:    
Capital expenditures (3,876) (3,458)
Acquisition of business (72,000) 0
Sales and maturities of marketable securities 0 1,500
Change in restricted cash and cash equivalents (3,592) (8,215)
Purchases of restricted investments (11,222) 0
Maturities of restricted investments 3,164 4,288
Net cash used in investing activities (87,526) (5,885)
Cash flows from financing activities:    
Net proceeds from stock option exercises and employee stock purchase plans 477 411
Common stock repurchases for taxes upon vesting of restricted stock (2,229) (3,026)
Net change in revolving credit facility (78,988) (88,000)
Payments on debt and other liabilities (756) (566)
Other 171 865
Net cash used in financing activities (81,325) (90,316)
Effect of exchange rate changes on cash and cash equivalents 453 (1,446)
Net change in cash and cash equivalents (7,893) (1,887)
CASH AND CASH EQUIVALENTS, beginning of period 29,781 19,666
CASH AND CASH EQUIVALENTS, end of period $ 21,888 $ 17,779