Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Components of income (loss) before provision for (benefit from) income taxes
United States					$ 343,515	$ (719,859)	$ (621,455)
Foreign					(283,070)	(34,767)	(20,723)
Income (loss) before provision for income taxes	210,801	200,610	(174,870)	(176,096)	60,445	(754,626)	(642,178)
Current taxes:
United States					22,275
Foreign					(561)
State					8,655
Total					30,369
Deferred taxes:
United States					19,629
Foreign					(32,692)
State					1,960
Total					(11,103)
Provision for income taxes	$ 22,660	$ (27,842)	$ 24,448		$ 19,266