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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 27, 2013
Dec. 28, 2012
Dec. 30, 2011
Cash flows from operating activities:      
Net income $ 44,924 $ 33,629 $ 30,791
Adjustments to reconcile net income to net cash from operating activities:      
Depreciation and amortization 20,472 18,890 16,384
Provision for doubtful accounts 12,063 6,994 6,638
Stock-based compensation 8,412 7,917 7,432
Deferred income taxes (3,844) 3,091 (1,910)
Other operating activities 2,116 1,946 (473)
Changes in operating assets and liabilities, net of acquisitions:      
Accounts receivable (4,181) (20,408) (51,824)
Income taxes 4,113 (3,748) 3,513
Other assets (7,341) (1,214) (1,244)
Accounts payable and other accrued expenses (3,592) 1,524 5,423
Accrued wages and benefits (3,643) (182) 10,793
Workers’ compensation claims reserve 9,859 3,746 4,537
Other liabilities 6,710 138 529
Net cash provided by operating activities 86,068 52,323 30,589
Cash flows from investing activities:      
Capital expenditures (13,003) (17,826) (9,707)
Acquisition of businesses, net of cash acquired (77,560) 0 0
Purchases of marketable securities (40,800) 0 0
Sales and maturities of marketable securities 20,050 0 0
Change in restricted cash and cash equivalents (16,122) 7,587 68,504
Purchases of restricted investments (13,411) (33,778) (88,173)
Maturities of restricted investments 15,581 18,116 9,238
Other 0 (250) (6,800)
Net cash used in investing activities (125,265) (26,151) (26,938)
Cash flows from financing activities:      
Purchases and retirement of common stock 0 (4,386) (56,932)
Net proceeds from stock option exercises and employee stock purchase plans 9,136 4,164 1,131
Common stock repurchases for taxes upon vesting of restricted stock (2,800) (2,154) (1,776)
Proceeds from note payable 34,000 0 0
Payments on debt and other liabilities (8,681) (4,548) (302)
Other 713 751 664
Net cash provided by (used in) financing activities 32,368 (6,173) (57,215)
Effect of exchange rates on cash (681) 203 (278)
Net change in cash and cash equivalents (7,510) 20,202 (53,842)
CASH AND CASH EQUIVALENTS, beginning of period 129,513 109,311 163,153
CASH AND CASH EQUIVALENTS, end of period $ 122,003 $ 129,513 $ 109,311