CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net Income (Loss) [Abstract]
Net income (loss)	$ 30,891	$ (3,672)	$ 26,674	$ (3,633)
Other Comprehensive Income (Loss), Net of Tax, Portion [Abstract]
Foreign Currency Translation Adjustment	(111)	210	(266)	415
Unrealized (Losses) Gains on Available-for-Sale Securities and Non-Marketable Securities	(1,640)	924	(1,035)	2,038
Reclassification Adjustment for Realized Gains (Losses) Recognized in Net Income (Loss)	1,426	(15)	1,426	(1,073)
Unrealized Gains (Losses) on Cash Flow Hedges	248	(50)	(268)	(50)
Net Change in Other Comprehensive (Loss) Income, Net of Tax	(77)	1,069	(143)	1,330
Comprehensive Income (Loss)	$ 30,814	$ (2,603)	$ 26,531	$ (2,303)