Income Taxes (Schedule Of Provision For Income Tax Benefit (Expense) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Expense Benefit [Abstract]    
Current - Federal $ (40,385) $ (43,080)
Deferred - Federal (16,220) (25,308)
Income tax benefit (expense) $ (56,605) $ (68,388)