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Property And Equipment (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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Sep. 30, 2014
Diamondback Energy, Inc [Member]
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Oct. 11, 2012
Diamondback Energy, Inc [Member]
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Sep. 30, 2014
Diamondback [Member]
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Oct. 31, 2012
Diamondback [Member]
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Oct. 11, 2012
Diamondback [Member]
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May 07, 2012
Diamondback [Member]
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Jan. 31, 2013
Diamondback [Member]
Accounts Receivable - Related Party [Member]
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Sep. 30, 2014
Minimum [Member]
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Sep. 30, 2014
Maximum [Member]
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| Property, Plant and Equipment [Line Items] | ||||||||||||||
| Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool | $ 66,600,000 | $ 66,600,000 | ||||||||||||
| Capitalized general and administrative costs | 5,900,000 | 3,500,000 | 19,100,000 | 9,600,000 | ||||||||||
| Capitalized costs of oil and natural gas properties excluded from amortization | 1,452,730,000 | 1,452,730,000 | 950,590,000 | |||||||||||
| Expected number of years amortization will commence | 3 years | 5 years | ||||||||||||
| Investment (shares) | 942,000 | 7,914,036 | 942,000 | 7,914,036 | ||||||||||
| Promissory note receivable | 63,600,000 | |||||||||||||
| Payment received from Diamondback | $ 80,767,000 | $ 22,058,000 | $ 18,600,000 | |||||||||||
| Ownership interest | 1.70% | 21.40% | 35.00% | |||||||||||