Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Operating revenue	$ 63,753	$ 51,404
Operating expenses:
Cost of services provided	19,485	9,612
Product development	7,047	6,693
Sales and marketing	3,379	3,301
General and administrative	10,746	9,841
Amortization and depreciation	2,597	2,552
Total operating expenses	43,254	31,999
Operating income	20,499	19,405
Interest income	61	135
Interest expense	(719)	(247)
Non-operating (loss)/income - put options	0	454
Foreign currency exchange gain (loss)	892	(119)
Income before income taxes	20,733	19,628
Income tax expense	(2,397)	(4,211)
Net income	$ 18,336	$ 15,417
Basic earnings per common share	$ 0.51	$ 0.40
Diluted earnings per common share	$ 0.51	$ 0.40
Basic weighted average shares outstanding	35,708	38,318
Diluted weighted average shares outstanding	35,954	38,600