Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
Operating revenue	$ 52,566	$ 43,827
Operating expenses:
Cost of services provided	9,891	9,029
Product development	7,035	4,272
Sales and marketing	3,912	3,812
General and administrative	9,971	6,444
Amortization and depreciation	2,452	1,941
Total operating expenses	33,261	25,498
Operating income	19,305	18,329
Interest income	93	167
Interest expense	(362)	(253)
Other non-operating income	82	0
Foreign currency exchange loss	(170)	(296)
Income before income taxes	18,948	17,947
Income tax expense	(1,604)	(2,262)
Net income	$ 17,344	$ 15,685
Basic earnings per common share	$ 0.47	$ 0.43
Diluted earnings per common share	$ 0.45	$ 0.40
Basic weighted average shares outstanding	37,168	36,450
Diluted weighted average shares outstanding	38,779	39,523