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Property And Equipment (Schedule Of Property And Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Oil and natural gas properties $ 5,424,342 $ 3,923,154
Office furniture and fixtures 12,589 10,752
Building 16,915 5,398
Land 3,667 2,194
Total property and equipment 5,457,513 3,941,498
Accumulated depletion, depreciation, amortization and impairment (2,829,110) (1,050,879)
Property and equipment, net $ 2,628,403 $ 2,890,619