Segment Information (Reconciliation of Segment Income from Operations to Consolidated Income Before Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended							12 Months Ended
	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
Segment Reporting [Abstract]
Income (loss) from operations	$ (234,753)	$ (36,279)	$ (51,431)	$ (307,158)	$ 119,242	$ (596,893)	$ 27,797	$ (663,141)	$ (757,012)	$ 343,061
Interest expense								(381,267)	(317,615)	(230,186)
Interest and investment income								6,603	5,473	3,309
Nonoperating expense								(42,921)	(23,668)	(51,448)
Loss from continuing operations before income taxes								$ (1,080,726)	$ (1,092,822)	$ 64,736