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Supplemental Information On Oil And Gas Exploration And Production Activities (Capitalized Costs Related to Oil and Gas Producing Activities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Reserve Quantities [Line Items]    
Proven properties $ 1,526,588 $ 984,795
Unproven properties 950,590 626,295
Capitalized costs, gross 2,477,178 1,611,090
Accumulated depreciation, depletion, amortization and impairment reserve (779,561) (661,442)
Net capitalized costs 1,697,617 949,648
Diamondback Energy, Inc [Member]
    
Reserve Quantities [Line Items]    
Proven properties 92,074 123,370
Unproven properties 26,608 25,947
Capitalized costs, gross 118,682 149,317
Accumulated depreciation, depletion, amortization and impairment reserve (15,180) (31,052)
Net capitalized costs $ 103,502 $ 118,265