Segment Information (Reconciliation Statement Of Segment Income from Operations To Consolidated Income Before Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income from operations	$ (588,984)	$ 95,354	$ (534,903)	$ 197,592
Interest expense	(78,728)	(42,249)	(153,500)	(76,829)
Interest income	1,088	755	2,109	1,501
Bridge financing costs related to ICG		(49,490)		(49,490)
Other nonoperating expenses	(19,042)	(49,740)	(19,042)	(49,740)
Income before income taxes	(685,666)	4,120	(705,336)	72,524
Parent/Issuer [Member]
Income from operations	(584,886)	97,334	(527,288)	202,616
Interest expense	(89,740)	(48,033)	(171,837)	(88,654)
Interest income	6,309	4,309	11,138	8,052
Bridge financing costs related to ICG		(49,490)		(49,490)
Other nonoperating expenses	(17,349)	(49,490)	(17,349)	(49,490)
Income before income taxes	$ (685,666)	$ 4,120	$ (705,336)	$ 72,524