CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues	$ 388,283	$ 162,370	$ 838,046	$ 435,491
Cost of services	269,244	107,842	575,005	289,015
Gross profit	119,039	54,528	263,041	146,476
Selling, general and administrative expenses	82,543	40,792	196,944	115,546
Operating income	36,496	13,736	66,097	30,930
Interest expense	(6,317)	(750)	(11,925)	(2,264)
Interest income	33	18	39	39
Income before income taxes	30,212	13,004	54,211	28,705
Provision for income taxes	12,779	5,237	22,880	11,909
Net income	17,433	7,767	31,331	16,796
Earnings per share:
Basic (in dollars per share)	$ 0.33	$ 0.21	$ 0.70	$ 0.46
Diluted (in dollars per share)	$ 0.33	$ 0.21	$ 0.68	$ 0.44
Number of shares and share equivalents used to calculate earnings per share:
Basic (in shares)	52,131	37,001	44,777	36,866
Diluted (in shares)	53,162	37,769	45,807	37,756
Reconciliation of net income to comprehensive income:
Net income	17,433	7,767	31,331	16,796
Changes in fair value of derivative, net of tax of $56 and $67 for the three months ended September 30, 2012 and 2011, respectively and $32 and $261 for the nine months ended September 30, 2012 and 2011, respectively	(93)	(113)	(54)	(440)
Foreign currency translation adjustment	776	(1,908)	106	(470)
Comprehensive income	$ 18,116	$ 5,746	$ 31,383	$ 15,886