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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net income $ 26,214 $ 23,227
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 14,156 11,989
Provision for doubtful accounts 4,305 4,424
Stock-based compensation 6,268 5,583
Deferred income taxes 1,191 899
Other operating activities 1,196 (471)
Changes in operating assets and liabilities:    
Accounts receivable (33,528) (70,116)
Income taxes 2,206 6,950
Other assets (592) 1,720
Accounts payable and other accrued expenses (2,906) 19,634
Accrued wages and benefits 8,248 12,033
Workers' compensation claims reserve 5,930 735
Other liabilities 280 (144)
Net cash provided by operating activities 32,968 16,463
Cash flows from investing activities:    
Capital expenditures (13,930) (6,251)
Change in restricted cash and cash equivalents 487 65,104
Purchases of restricted investments (18,153) (87,768)
Maturities of restricted investments 14,418 6,193
Other (250) (6,800)
Net cash used in investing activities (17,428) (29,522)
Cash flows from financing activities:    
Purchases and retirement of common stock (4,386) (50,143)
Net proceeds from stock option exercises and employee purchase plans 3,806 874
Common stock repurchases for taxes upon vesting of restricted stock (2,076) (1,692)
Payments on other liabilities (3,987) (302)
Other 764 674
Net cash used in financing activities (5,879) (50,589)
Effect of exchange rates on cash 369 (455)
Net change in cash and cash equivalents 10,030 (64,103)
CASH AND CASH EQUIVALENTS, beginning of period 109,311 163,153
CASH AND CASH EQUIVALENTS, end of period $ 119,341 $ 99,050