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Property And Equipment (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 1 Months Ended | 6 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2012
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Jun. 30, 2013
Diamondback [Member]
member_of_board_of_directors
advisor
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Oct. 23, 2012
Diamondback [Member]
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Oct. 17, 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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Jun. 30, 2013
Minimum [Member]
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Jun. 30, 2013
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 | $ 38,700,000 | $ 38,700,000 | |||||||||||
| Capitalized general and administrative costs | 3,200,000 | 2,200,000 | 6,100,000 | 4,100,000 | |||||||||
| Capitalized costs of oil and natural gas properties excluded from amortization | 872,113,000 | 872,113,000 | 626,295,000 | ||||||||||
| Expected number of years amortization will commence | 3 years | 5 years | |||||||||||
| Investment (shares) | 7,914,036 | ||||||||||||
| Promissory note receivable | 63,600,000 | ||||||||||||
| Payment received from Diamondback | $ 5,183,000 | $ (4,750,000) | $ 18,600,000 | ||||||||||
| Ownership requirement to meet agreement | 10.00% | ||||||||||||
| Number of directors allowed to serve on Board | 1 | ||||||||||||
| Number of advisors allowed to serve on Board | 1 | ||||||||||||
| Ownership interest | 21.40% | 22.50% | 35.00% | ||||||||||