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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 28, 2012
Dec. 30, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 33,629 $ 30,791 $ 19,839
Adjustments to reconcile net income to net cash from operating activities:      
Depreciation and amortization 18,890 16,384 16,468
Provision for doubtful accounts 6,994 6,638 8,158
Stock-based compensation 7,917 7,432 7,159
Deferred income taxes 3,091 (1,910) 5,322
Other operating activities 1,946 (473) (202)
Changes in operating assets and liabilities:      
Accounts receivable (20,408) (51,824) (11,604)
Income taxes (3,748) 3,513 (3,338)
Other assets (1,214) (1,244) (727)
Accounts payable and other accrued expenses 1,524 5,423 747
Accrued wages and benefits (182) 10,793 2,752
Workers’ compensation claims reserve 3,746 4,537 (2,195)
Other liabilities 138 529 (406)
Net cash provided by operating activities 52,323 30,589 41,973
Cash flows from investing activities:      
Capital expenditures (17,826) (9,707) (7,050)
Change in restricted cash and cash equivalents 7,587 68,504 3,945
Purchases of restricted investments (33,778) (88,173) 0
Maturities of restricted investments 18,116 9,238 0
Other (250) (6,800) (298)
Net cash used in investing activities (26,151) (26,938) (3,403)
Cash flows from financing activities:      
Purchases and retirement of common stock (4,386) (56,932) 0
Net proceeds from stock option exercises and employee stock purchase plans 4,164 1,131 1,054
Common stock repurchases for taxes upon vesting of restricted stock (2,154) (1,776) (1,568)
Payments on other liabilities (4,548) (302) (382)
Other 751 664 129
Net cash used in financing activities (6,173) (57,215) (767)
Effect of exchange rates on cash 203 (278) 973
Net change in cash and cash equivalents 20,202 (53,842) 38,776
CASH AND CASH EQUIVALENTS, beginning of period 109,311 163,153 124,377
CASH AND CASH EQUIVALENTS, end of period $ 129,513 $ 109,311 $ 163,153