Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net Income (Loss) Attributable to Parent	$ 45,569	$ 37,375	$ 109,281	$ 98,169
Foreign currency translation adjustment	(328)	(4,652)	(9,566)	(12,777)
Change in fair value on available-for-sale investments, net of tax expense (benefit) of $1,378 and $1,440 for the three and nine months of 2016, respectively, ($625) and ($3,242) for the three and nine months of 2015.	(2,249)	(1,057)	(2,359)	(4,611)
Other Comprehensive Income (Loss), Net of Tax	(2,577)	(5,709)	(11,925)	(17,388)
Comprehensive Income	$ 42,992	$ 31,666	$ 97,356	$ 80,781