Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Operating revenue	$ 72,574	$ 64,712	$ 143,640	$ 128,465
Operating expenses:
Cost of services provided	20,579	18,699	40,181	38,184
Product development	8,285	7,288	16,350	14,335
Sales and marketing	4,206	3,611	8,539	6,990
General and administrative	13,310	12,121	24,893	22,867
Amortization and depreciation	2,630	2,570	5,350	5,167
Total operating expenses	49,010	44,289	95,313	87,543
Operating income	23,564	20,423	48,327	40,922
Interest income	441	44	584	105
Interest expense	(2,185)	(625)	(3,459)	(1,344)
Foreign currency exchange gain (loss)	(195)	330	274	1,222
Income before income taxes	21,625	20,172	45,726	40,905
Income tax benefit (expense)	1,418	(1,136)	(332)	(3,533)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	23,043	19,036	45,394	37,372
Net Income (Loss) Attributable to Noncontrolling Interest	51	0	243	0
Net Income (Loss) Attributable to Parent	$ 22,992	$ 19,036	$ 45,151	$ 37,372
Basic earnings per common share	$ 0.70	$ 0.54	$ 1.37	$ 1.06
Diluted earnings per common share	$ 0.70	$ 0.54	$ 1.36	$ 1.05
Basic weighted average shares outstanding	32,688	35,046	32,866	35,375
Diluted weighted average shares outstanding	32,969	35,269	33,140	35,610