Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Operating revenue	$ 108,230	$ 79,103
Operating expenses:
Cost of services provided	39,591	25,187
Product development	8,434	8,350
Sales and marketing	3,998	4,337
General and administrative	19,504	12,684
Amortization and depreciation	2,807	2,855
Total operating expenses	74,334	53,413
Operating income	33,896	25,690
Interest income	121	774
Interest expense	(4,847)	(2,468)
Non-operating income, gain on joint venture investment (see Note 8)	53	0
Foreign currency exchange gain (loss)	(641)	3,496
Income before income taxes	28,582	27,492
Income tax (expense) benefit	(2,126)	(869)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	26,456	26,623
Net Income (Loss) Attributable to Noncontrolling Interest	248	196
Net Income (Loss) Attributable to Parent	$ 26,208	$ 26,427
Basic earnings per common share	$ 0.83	$ 0.83
Diluted earnings per common share	$ 0.83	$ 0.83
Basic weighted average shares outstanding	31,482	31,807
Diluted weighted average shares outstanding	31,659	31,973