Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Operating revenue	$ 128,643	$ 92,800	$ 361,499	$ 259,290
Operating expenses:
Cost of Goods and Services Sold	42,963	34,937	126,113	91,056
Product development	11,010	8,536	28,115	25,303
Sales and marketing	4,721	3,833	13,542	12,312
General and administrative	28,188	14,874	74,416	42,156
Amortization and depreciation	2,523	2,709	7,864	8,323
Total operating expenses	89,405	64,889	250,050	179,150
Operating income	39,238	27,911	111,449	80,140
Interest income	103	375	309	1,614
Interest expense	(7,467)	(3,552)	(18,064)	(9,038)
Non-operating income, gain on joint venture investment (see Note 8)	7	0	60	0
Foreign currency exchange (loss) gain	(921)	(400)	(2,919)	2,705
Income before income taxes	30,960	24,334	90,835	75,421
Income tax benefit (expense)	(1,679)	204	(6,027)	(363)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	29,281	24,538	84,808	75,058
Net Income (Loss) Attributable to Noncontrolling Interest	39	354	178	1,013
Net Income (Loss) Attributable to Parent	$ 29,242	$ 24,184	$ 84,630	$ 74,045
Basic earnings per common share	$ 0.93	$ 0.77	$ 2.69	$ 2.34
Diluted earnings per common share	$ 0.92	$ 0.76	$ 2.67	$ 2.33
Basic weighted average shares outstanding	31,492	31,453	31,480	31,582
Diluted weighted average shares outstanding	31,628	31,622	31,638	31,743