Annual report pursuant to Section 13 and 15(d)

Supplemental Information On Oil And Gas Exploration And Production Activities (Results of Operations for Producing Activities) (Details)

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Supplemental Information On Oil And Gas Exploration And Production Activities (Results of Operations for Producing Activities) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Results of Operations for Oil and Gas Producing Activities [Line Items]      
Revenues $ 262,225,000 $ 248,601,000 $ 228,953,000
Production costs (64,666,000) (53,708,000) (47,230,000)
Depletion (118,118,000) (90,230,000) (61,965,000)
Results of operations, before income taxes 79,441,000 104,663,000 119,758,000
Current 0 730,000 282,000
Deferred 49,447,000 25,633,000 (372,000)
Income tax expense 49,447,000 26,363,000 (90,000)
Results of operations from producing activities 29,994,000 78,300,000 119,848,000
Depletion per barrel of oil equivalent (BOE) 28.68 35.07 26.56
Diamondback Energy, Inc [Member]
      
Results of Operations for Oil and Gas Producing Activities [Line Items]      
Revenues 14,976,000 16,042,000 0
Production costs (2,518,000) (4,474,000) 0
Depletion (4,754,000) (5,515,000) 0
Results of operations, before income taxes 7,704,000 6,053,000 0
Income tax expense 2,286,000 2,158,000 0
Results of operations from producing activities $ 5,418,000 $ 3,895,000 $ 0