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 expense	$ (16,785)	$ (19,291)	$ (16,972)	$ (16,430)
Deferred tax benefit (expense)	8,703	(3,069)	24,184	16,425
Income tax benefit (expense)	$ (8,082)	$ (22,360)	$ 7,212	$ (5)