Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Operating revenue	$ 74,608	$ 66,813	$ 218,248	$ 195,278
Operating expenses:
Cost of services provided	22,425	17,809	62,606	55,993
Product development	8,563	8,338	24,913	22,673
Sales and marketing	4,463	3,805	13,002	10,795
General and administrative	12,126	12,128	37,019	34,995
Amortization and depreciation	2,738	2,765	8,088	7,932
Total operating expenses	50,315	44,845	145,628	132,388
Operating income	24,293	21,968	72,620	62,890
Interest income	635	62	1,219	167
Interest expense	(1,922)	(1,058)	(5,381)	(2,402)
Other Nonoperating Income (Expense)	1,162	0	1,162	0
Foreign currency exchange gain	578	1,137	852	2,359
Income before income taxes	24,746	22,109	70,472	63,014
Income tax benefit (expense)	(789)	(1,877)	(1,121)	(5,410)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	23,957	20,232	69,351	57,604
Net Income (Loss) Attributable to Noncontrolling Interest	(110)	0	133	0
Net Income (Loss) Attributable to Parent	$ 24,067	$ 20,232	$ 69,218	$ 57,604
Basic earnings per common share	$ 0.74	$ 0.59	$ 2.12	$ 1.65
Diluted earnings per common share	$ 0.74	$ 0.59	$ 2.10	$ 1.63
Basic weighted average shares outstanding	32,421	34,304	32,716	35,014
Diluted weighted average shares outstanding	32,705	34,515	32,994	35,241