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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 27, 2013
Sep. 28, 2012
Cash flows from operating activities:    
Net income $ 30,412 $ 26,214
Adjustments to reconcile net income to net cash from operating activities:    
Depreciation and amortization 15,133 14,156
Provision for doubtful accounts 8,785 4,305
Stock-based compensation 6,428 6,268
Deferred income taxes (1,694) 1,191
Other operating activities 1,213 1,196
Changes in operating assets and liabilities, net of acquisitions:    
Accounts receivable (24,776) (33,528)
Income taxes 6,580 2,206
Other assets (4,703) (592)
Accounts payable and other accrued expenses (6,728) (2,906)
Accrued wages and benefits 11,419 8,248
Workers’ compensation claims reserve 2,785 5,930
Other liabilities 423 280
Net cash provided by operating activities 45,277 32,968
Cash flows from investing activities:    
Capital expenditures (10,350) (13,930)
Acquisition of businesses, net of cash acquired (54,872) 0
Purchases of marketable securities (35,300) 0
Maturities of marketable securities 205 0
Change in restricted cash and cash equivalents (1,338) 487
Purchases of restricted investments (9,175) (18,153)
Maturities of restricted investments 13,337 14,418
Other 0 (250)
Net cash used in investing activities (97,493) (17,428)
Cash flows from financing activities:    
Purchases and retirement of common stock 0 (4,386)
Net proceeds from stock option exercises and employee stock purchase plans 8,731 3,806
Common stock repurchases for taxes upon vesting of restricted stock (2,653) (2,076)
Proceeds from note payable 34,000 0
Payments on debt and other liabilities (8,115) (3,987)
Other 719 764
Net cash provided by (used in) financing activities 32,682 (5,879)
Effect of exchange rates on cash (435) 369
Net change in cash and cash equivalents (19,969) 10,030
CASH AND CASH EQUIVALENTS, beginning of period 129,513 109,311
CASH AND CASH EQUIVALENTS, end of period $ 109,544