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Supplemental Disclosures (Schedule Of Income Tax Benefit) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Supplemental Disclosures [Abstract]        
Current tax benefit (expense) $ (21,148) $ (11,326) $ 21,331 $ (376)
Deferred tax benefit 34,380 31,991 157,962 122,886
Income tax benefit $ 13,232 $ 20,665 $ 179,293 $ 122,510