Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Operating revenue	$ 124,626	$ 87,387	$ 232,856	$ 166,490
Operating expenses:
Cost of Goods and Services Sold	43,559	30,932	83,150	56,119
Product development	8,671	8,417	17,105	16,767
Sales and marketing	4,823	4,142	8,821	8,479
General and administrative	26,724	14,598	46,228	27,282
Amortization and depreciation	2,534	2,759	5,341	5,614
Total operating expenses	86,311	60,848	160,645	114,261
Operating income	38,315	26,539	72,211	52,229
Interest income	85	465	206	1,239
Interest expense	(5,750)	(3,018)	(10,597)	(5,486)
Non-operating income, gain on joint venture investment (see Note 8)	0	0	53	0
Foreign currency exchange (loss) gain	(1,357)	(391)	(1,998)	3,105
Income before income taxes	31,293	23,595	59,875	51,087
Income tax expense	(2,222)	302	(4,348)	(567)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	29,071	23,897	55,527	50,520
Net Income (Loss) Attributable to Noncontrolling Interest	(109)	463	139	659
Net Income (Loss) Attributable to Parent	$ 29,180	$ 23,434	$ 55,388	$ 49,861
Basic earnings per common share	$ 0.93	$ 0.74	$ 1.76	$ 1.58
Diluted earnings per common share	$ 0.92	$ 0.74	$ 1.75	$ 1.57
Basic weighted average shares outstanding	31,465	31,490	31,474	31,648
Diluted weighted average shares outstanding	31,626	31,637	31,643	31,805