Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Statement [Abstract]
Operating revenue	$ 144,275	$ 124,626	$ 287,199	$ 232,856
Operating expenses:
Cost of Goods and Services Sold	50,954	43,559	96,883	83,150
Product development	11,397	8,671	22,639	17,105
Sales and marketing	4,493	4,823	10,614	8,821
General and administrative	32,866	26,724	54,310	46,228
Amortization and depreciation	3,283	2,534	7,340	5,341
Total operating expenses	102,993	86,311	191,786	160,645
Operating income	41,282	38,315	95,413	72,211
Interest income	129	85	479	206
Interest expense	(11,763)	(5,750)	(21,581)	(10,597)
Other Non-operating income	(11)	0	(8)	53
Nonoperating Income (Expense)	(688)	0	(21,140)	0
Foreign currency exchange gain (loss)	401	(1,357)	146	(1,998)
Income before income taxes	29,350	31,293	53,309	59,875
Income tax benefit (expense)	(1,004)	(2,222)	80	(4,348)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	28,346	29,071	53,389	55,527
Net Income (Loss) Attributable to Noncontrolling Interest	(505)	(109)	(1,172)	139
Net Income (Loss) Attributable to Parent	$ 28,851	$ 29,180	$ 54,561	$ 55,388
Basic earnings per common share	$ 0.95	$ 0.93	$ 1.79	$ 1.76
Diluted earnings per common share	$ 0.94	$ 0.92	$ 1.78	$ 1.75
Basic weighted average shares outstanding	30,528	31,465	30,526	31,474
Diluted weighted average shares outstanding	30,668	31,626	30,636	31,643