Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 37,375	$ 28,759	$ 98,169	$ 92,573
Foreign currency translation adjustment, net of tax expense (benefit) of zero and zero for the three and nine months of 2015, respectively, and ($2,456) and ($1,757) for the three and nine months of 2014, respectively	(4,652)	(6,977)	(12,777)	(4,806)
Unrealized (loss) on available-for-sale investments, net of tax expense (benefit) of ($625) and ($3,242) for the three and nine months of 2015, respectively, and ($1,440) and ($1,295) for the three and nine months of 2014, respectively	(1,057)	(3,006)	(4,611)	(2,761)
Other Comprehensive Income (Loss), Net of Tax	(5,709)	(9,983)	(17,388)	(7,567)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 31,666	$ 18,776	$ 80,781	$ 85,006