Supplemental Disclosures (Schedule Of Income Tax Benefit) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Supplemental Disclosures [Abstract]
Current tax benefit (expense)	$ 2,088	$ (21,148)	$ (36,706)	$ 21,331
Deferred tax benefit	71,714	34,380	195,356	157,962
Income tax benefit	$ 73,802	$ 13,232	$ 158,650	$ 179,293