CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013
Cash flows from operating activities:
Net income	$ 38,650	$ 30,412
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	20,126	15,133
Provision for doubtful accounts	9,619	8,785
Stock-based compensation	8,902	6,428
Deferred income taxes	6,077	(1,694)
Other operating activities	(148)	1,213
Changes in operating assets and liabilities, net of acquisition:
Accounts receivable	(26,391)	(24,776)
Income taxes	(3,179)	6,580
Other assets	(6,510)	(4,703)
Accounts payable and other accrued expenses	(1,687)	(6,728)
Accrued wages and benefits	11,373	11,419
Workers’ compensation claims reserve	532	2,785
Other liabilities	2,539	423
Net cash provided by operating activities	59,903	45,277
Cash flows from investing activities:
Capital expenditures	(10,213)	(10,350)
Acquisition of businesses, net of cash acquired	(307,972)	(54,872)
Purchases of marketable securities	(25,057)	(35,300)
Sales and maturities of marketable securities	43,917	205
Change in restricted cash and cash equivalents	10,020	(1,338)
Purchases of restricted investments	(18,196)	(9,175)
Maturities of restricted investments	10,588	13,337
Net cash used in investing activities	(296,913)	(97,493)
Cash flows from financing activities:
Net proceeds from stock option exercises and employee stock purchase plans	1,673	8,731
Common stock repurchases for taxes upon vesting of restricted stock	(3,021)	(2,653)
Proceeds from long-term debt	186,994	34,000
Payments on debt and other liabilities	(41,700)	(8,115)
Other	1,242	720
Net cash provided by financing activities	145,188	32,683
Effect of exchange rates on cash	(937)	(435)
Net change in cash and cash equivalents	(92,759)	(19,968)
CASH AND CASH EQUIVALENTS, beginning of period	122,003	129,513
CASH AND CASH EQUIVALENTS, end of period	$ 29,244	$ 109,545