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Property And Equipment (Narrative) (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | May 07, 2012 Contribution Agreement With Diamondback Energy Inc [Member]
Property, Plant and Equipment [Line Items] |  |  |  |  |
Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool |  |  | $ 27,630,000 |  |
Capitalized general and administrative costs | 2,160,000 | 1,411,000 | 4,136,000 | 2,788,000 |
Outstanding common stock prior to closing, interest percent, received in exchange for contribution of oil and gas interests |  |  |  |  | 35.00%
Non-interest bearing promissory note received in exchange for contribution of oil and gas interests |  |  |  |  | $ 63,590,050.00
Minimum threshold of ownership interest for designating a nominee to serve on the board of directors |  |  |  |  | 10.00%

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