Property And Equipment (Narrative) (Details) (USD $)
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3 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Mar. 31, 2013
|
Mar. 31, 2012
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Dec. 31, 2012
|
Mar. 31, 2013
Diamondback [Member]
member_of_board_of_directors
advisor
|
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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Mar. 31, 2013
Minimum [Member]
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Mar. 31, 2013
Maximum [Member]
|
|
Property, Plant and Equipment [Line Items] | |||||||||||
Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool | $ 35,500,000 | ||||||||||
Capitalized general and administrative costs | 2,900,000 | 2,000,000 | |||||||||
Capitalized costs of oil and natural gas properties excluded from amortization | 869,879,000 | 626,295,000 | 626,300,000 | ||||||||
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 | $ (3,592,000) | $ 1,718,000 | $ 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% |