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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 28, 2013
Jun. 29, 2012
Cash flows from operating activities:    
Net income $ 11,462 $ 11,867
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 10,362 9,496
Provision for doubtful accounts 6,415 2,022
Stock-based compensation 4,594 4,846
Deferred income taxes (2,564) (15)
Other operating activities 848 972
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable (8,528) (11,938)
Income taxes (143) 4,488
Other assets 341 2,084
Accounts payable and other accrued expenses (7,496) (3,173)
Accrued wages and benefits 7,053 5,949
Workers’ compensation claims reserve 1,583 882
Other liabilities 186 277
Net cash provided by operating activities 24,113 27,757
Cash flows from investing activities:    
Capital expenditures (7,200) (9,535)
Acquisition of businesses, net of cash acquired (54,873) 0
Change in restricted cash and cash equivalents 3,709 9,774
Purchases of restricted investments (6,789) (18,153)
Maturities of restricted investments 10,871 12,726
Net cash used in investing activities (54,282) (5,188)
Cash flows from financing activities:    
Purchases and retirement of common stock 0 (3,990)
Net proceeds from stock option exercises and employee stock purchase plans 6,023 3,142
Common stock repurchases for taxes upon vesting of restricted stock (2,182) (1,996)
Proceeds from note payable 34,000 0
Payments on debt (1,115) (88)
Other 478 556
Net cash provided by (used in) financing activities 37,204 (2,376)
Effect of exchange rates on cash (544) (58)
Net change in cash and cash equivalents 6,491 20,135
CASH AND CASH EQUIVALENTS, beginning of period 129,513 109,311
CASH AND CASH EQUIVALENTS, end of period $ 136,004 $ 129,446