CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Revenues	$ 283,186	$ 143,683	$ 450,264	$ 273,121
Cost of services	194,232	94,889	306,262	181,173
Gross profit	88,954	48,794	144,002	91,948
Selling, general and administrative expenses	69,300	37,999	114,401	74,754
Operating income	19,654	10,795	29,601	17,194
Interest expense	(4,906)	(784)	(5,608)	(1,514)
Interest income	5	4	6	21
Income before income taxes	14,753	10,015	23,999	15,701
Provision for income taxes	6,238	4,150	10,101	6,672
Net income	8,515	5,865	13,898	9,029
Earnings per share:
Basic (in dollars per share)	$ 0.19	$ 0.16	$ 0.34	$ 0.25
Diluted (in dollars per share)	$ 0.19	$ 0.16	$ 0.33	$ 0.24
Number of shares and share equivalents used to calculate earnings per share:
Basic (in shares)	44,852	36,971	41,060	36,798
Diluted (in shares)	45,879	37,718	42,067	37,623
Reconciliation of net income to comprehensive income:
Net income	8,515	5,865	13,898	9,029
Changes in fair value of derivative, net of tax of $204 and $111 for the three months ended June 30, 2012 and 2011, respectively and $204 and $194 for the six months ended June 30, 2012 and 2011, respectively	39	(188)	39	(327)
Foreign currency translation adjustment	(1,767)	818	(670)	1,438
Comprehensive income	$ 6,787	$ 6,495	$ 13,267	$ 10,140