Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Income tax benefit (expense)	$ 138,765	$ (44,655)	$ 338,592	$ (82,917)
(Loss) income from continuing operations before income tax	$ (390,814)	$ 113,830	$ (1,005,784)	$ 215,494
Effective income tax rate on earnings from continuing operations before income taxes	35.50%	39.20%	33.70%	38.50%