Income Taxes (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Loss From Continuing Operations [Abstract]
United States									$ 210,580,000	$ (2,892,207,000)	$ 689,754,000
Foreign									23,642,000	15,096,000	21,118,000
(Loss) income before income tax (benefit) provision	$ 34,262,000	$ 64,291,000	$ 117,868,000	$ 17,801,000	$ (463,267,000)	$ (601,971,000)	$ (1,941,624,000)	$ 129,751,000	$ 234,222,000	$ (2,877,111,000)	$ 710,872,000