Supplemental Disclosures (Schedule Of Income Tax Benefit (Expense)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Supplemental Disclosures [Abstract]
Current tax benefit (expense)	$ (28,128)	$ (16,481)	$ (38,794)	$ 42,479
Deferred tax benefit	16,651	25,144	123,642	123,582
Income tax benefit (expense)	$ (11,477)	$ 8,663	$ 84,848	$ 166,061