CONSOLIDATED STATEMENTS OF OPERATIONS & COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014		Sep. 27, 2013
Revenue from services	$ 633,365	$ 451,169	$ 1,482,655		$ 1,219,977
Cost of services	473,766	327,641	1,103,914		897,937
Gross profit	159,599	123,528	378,741		322,040
Selling, general and administrative expenses	120,318	90,767	308,654		268,538
Depreciation and amortization	9,719	4,771	20,126		15,133
Income from operations	29,562	27,990	49,961		38,369
Interest expense	(1,140)	(350)	(1,725)		(919)
Interest and other income	731	766	2,110		2,086
Interest and other income (expense), net	(409)	416	385		1,167
Income before tax expense	29,153	28,406	50,346		39,536
Income tax expense	8,243	9,454	11,696		9,124
Net income	20,910	18,952	38,650		30,412
Net income per common share:
Basic (in dollars per share)	$ 0.51	$ 0.47	$ 0.95		$ 0.76
Diluted (in dollars per share)	$ 0.51	$ 0.47	$ 0.94		$ 0.75
Weighted average shares outstanding:
Basic (in shares)	40,793	40,330	40,701		40,085
Diluted (in shares)	41,038	40,670	40,971		40,395
Other comprehensive income (loss):
Foreign currency translation adjustment, net of tax	(1,087)	109	(997)		(439)
Unrealized gain (loss) on investments, net of tax	(81)	(30)	372		(37)
Total other comprehensive income (loss), net of tax	(1,168)	79	(625)	[1]	(476)
Comprehensive income	$ 19,742	$ 19,031	$ 38,025		$ 29,936

[1] The tax impact of the components of other comprehensive income was immaterial.