Condensed Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 22,771	$ 28,539
Foreign currency translation adjustment, net of tax (benefit) of ($714) and $428, respectively.	(1,753)	1,463
Unrealized gain (loss) on available-for-sale investments, net of tax (benefit) of $1,628 and $37, respectively.	2,821	127
Other Comprehensive Income (Loss), Net of Tax	1,068	1,590
Comprehensive Income	23,997	30,129
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	23,839	30,129
Net Income (Loss) Attributable to Noncontrolling Interest	(151)	0
Foreign currency translation adjustment attributable to noncontrolling Interest, net of tax (benefit) of ($6) and zero, respectively.	$ (7)	$ 0