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
	Mar. 31, 2012	Mar. 31, 2011
Income from operations	$ 54,081	$ 102,238
Interest expense	(74,772)	(34,580)
Interest income	1,021	746
Income before income taxes	(19,670)	68,404
Parent/Issuer [Member]
Income from operations	57,599	105,283
Interest expense	(82,096)	(40,621)
Interest income	$ 4,827	$ 3,742