Condensed Consolidated Statements Of Income 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	$ 110,078	$ 86,423	$ 308,261	$ 239,401
Operating expenses:
Cost of revenues (exclusive of depreciation and amortization)	69,099	51,627	193,077	145,948
Selling, general and administrative expenses	21,153	15,822	59,491	46,420
Depreciation and amortization expense	3,040	2,083	7,674	5,732
Goodwill impairment loss				1,697
Other operating expenses, net	50		669	23
Income from operations	16,736	16,891	47,350	39,581
Interest and other income, net	486	385	1,422	1,000
Foreign exchange loss	(635)	(2,301)	(1,949)	(3,138)
Income before provision for income taxes	16,587	14,975	46,823	37,443
Provision for income taxes	2,522	1,025	7,338	5,474
Net Income	14,065	13,950	39,485	31,969
Comprehensive income (Note 10)	16,769	12,130	41,337	31,568
Accretion of preferred stock				(17,563)
Net income allocated to participating securities		(7,822)	(3,259)	(12,010)
Net income/(loss) available for common stockholders	14,065	6,128	36,226	2,396
Common stock
Operating expenses:
Net Income	14,065	13,950	39,485	31,969
Net income/(loss) available for common stockholders	$ 14,065	$ 6,128	$ 36,226	$ 2,396
Net income/(loss) per share of common stock:
Basic	$ 0.33	$ 0.36	$ 0.93	$ 0.14
Diluted	$ 0.30	$ 0.33	$ 0.85	$ 0.14
Shares used in calculation of net income per share of common stock:
Basic	42,952	17,124	38,990	17,078
Diluted	46,501	20,656	42,729	20,156
Puttable common stock
Net income/(loss) per share of common stock:
Basic		$ 0.36		$ 0.40
Diluted		$ 0.33		$ 0.37
Shares used in calculation of net income per share of common stock:
Basic		18		44
Diluted		18		44