Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income (loss)	$ (220,872)	$ (123,603)	$ 85,248
Other comprehensive income:
Net unrealized gains on marketable securities	20
Other comprehensive income	20
Comprehensive income (loss)	$ (220,852)	$ (123,603)	$ 85,248