Supplemental Disclosures (Schedule Of Income Tax Benefit) (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
Supplemental Disclosures [Abstract]
Current tax benefit (expense)	$ (16,481)	$ (21,045)	$ 42,479	$ 10,950
Deferred tax benefit	25,144	30,229	123,582	90,895
Income tax benefit	$ 8,663	$ 9,184	$ 166,061	$ 101,845