Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Operating revenue	$ 79,103	$ 71,066
Operating expenses:
Cost of services provided	25,187	19,602
Product development	8,350	8,065
Sales and marketing	4,337	4,333
General and administrative	12,684	11,583
Amortization and depreciation	2,855	2,720
Total operating expenses	53,413	46,303
Operating income	25,690	24,763
Interest income	774	143
Interest expense	(2,468)	(1,274)
Foreign currency exchange gain	3,496	469
Income before income taxes	27,492	24,101
Income tax expense	(869)	(1,750)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	26,623	22,351
Net Income (Loss) Attributable to Noncontrolling Interest	196	192
Net Income (Loss) Attributable to Parent	$ 26,427	$ 22,159
Basic earnings per common share	$ 0.83	$ 0.67
Diluted earnings per common share	$ 0.83	$ 0.67
Basic weighted average shares outstanding	31,807	33,043
Diluted weighted average shares outstanding	31,973	33,310