CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 26, 2014	Dec. 27, 2013	Dec. 28, 2012
Cash flows from operating activities:
Net income	$ 65,675	$ 44,924	$ 33,629
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	29,474	20,472	18,890
Provision for doubtful accounts	11,815	12,063	6,994
Stock-based compensation	11,051	8,412	7,917
Deferred income taxes	12,663	(3,844)	3,091
Other operating activities	898	2,116	1,946
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(77,629)	(4,181)	(20,408)
Income taxes	(5,696)	4,113	(3,748)
Other assets	(7,361)	(7,341)	(1,214)
Accounts payable and other accrued expenses	(8,683)	(3,592)	1,524
Accrued wages and benefits	12,069	(3,643)	(182)
Workers’ compensation claims reserve	1,579	9,859	3,746
Other liabilities	1,670	6,710	138
Net cash provided by operating activities	47,525	86,068	52,323
Cash flows from investing activities:
Capital expenditures	(16,918)	(13,003)	(17,826)
Acquisition of businesses, net of cash acquired	(305,876)	(77,560)	0
Purchases of marketable securities	(25,057)	(40,800)	0
Sales and maturities of marketable securities	44,167	20,050	0
Change in restricted cash and cash equivalents	(9,283)	(16,122)	7,587
Purchases of restricted investments	(18,196)	(13,411)	(33,778)
Maturities of restricted investments	12,726	15,581	18,116
Other	0	0	(250)
Net cash used in investing activities	(318,437)	(125,265)	(26,151)
Cash flows from financing activities:
Purchases and retirement of common stock	0	0	(4,386)
Net proceeds from stock option exercises and employee stock purchase plans	2,191	9,136	4,164
Common stock repurchases for taxes upon vesting of restricted stock	(3,114)	(2,800)	(2,154)
Net change in Revolving Credit Facility	171,994	0	0
Proceeds from long-term debt	0	34,000	0
Payments on debt and other liabilities	(2,267)	(8,681)	(4,548)
Other	978	713	751
Net cash provided by (used in) financing activities	169,782	32,368	(6,173)
Effect of exchange rate changes on cash and cash equivalents	(1,207)	(681)	203
Net change in cash and cash equivalents	(102,337)	(7,510)	20,202
CASH AND CASH EQUIVALENTS, beginning of period	122,003	129,513	109,311
CASH AND CASH EQUIVALENTS, end of period	$ 19,666	$ 122,003	$ 129,513