Conslidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Statement of Income and Comprehensive Income [Abstract]
Net income (loss)	$ (4,584)	$ 60,233
Other comprehensive income (loss):
Foreign currency translation adjustments	811	0
Unrealized gains (losses) on available-for-sale securities	98	(262)
Other comprehensive income (loss) before tax	909	(262)
Income tax benefit (expense) related to items of other comprehensive income	38	(102)
Other comprehensive income (loss), net of tax	871	(160)
Comprehensive income (loss)	$ (3,713)	$ 60,073