Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Operating revenue	$ 50,293	$ 53,804	$ 153,863	$ 145,347
Operating expenses:
Cost of services provided	10,136	9,500	30,385	27,686
Product development	6,625	7,102	20,384	17,188
Sales and marketing	4,024	4,346	11,763	12,454
General and administrative	8,448	9,679	26,672	24,700
Amortization and depreciation	2,459	2,469	7,459	6,571
Total operating expenses	31,692	33,096	96,663	88,599
Operating income	18,601	20,708	57,200	56,748
Interest income	159	88	343	365
Interest expense	(318)	(440)	(961)	(1,005)
Non-operating income (loss) - put options	93	414	(1,250)	676
Non-operating expense - securities litigation	(4,226)	0	(4,226)	0
Foreign currency exchange gain (loss)	(33)	(536)	(326)	1,759
Income before income taxes	14,276	20,234	50,780	58,543
Income tax expense	(1,133)	(2,162)	(6,751)	(6,719)
Net income	$ 13,143	$ 18,072	$ 44,029	$ 51,824
Basic earnings per common share	$ 0.35	$ 0.49	$ 1.18	$ 1.41
Diluted earnings per common share	$ 0.34	$ 0.46	$ 1.14	$ 1.32
Basic weighted average shares outstanding	37,919	37,214	37,435	36,859
Diluted weighted average shares outstanding	38,451	39,120	38,676	39,158