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Property And Equipment (Narrative) (Details) (USD $)
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3 Months Ended | 9 Months Ended | 3 Months Ended | 1 Months Ended | 9 Months Ended | |||||||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2013
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Sep. 30, 2012
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Dec. 31, 2012
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Sep. 30, 2013
Diamondback [Member]
member_of_board_of_directors
advisor
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Oct. 23, 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, 2013
Minimum [Member]
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Sep. 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 | $ 42,200,000 | $ 42,200,000 | ||||||||||
| Capitalized general and administrative costs | 3,500,000 | 2,000,000 | 9,600,000 | 6,200,000 | ||||||||
| Capitalized costs of oil and natural gas properties excluded from amortization | 952,697,000 | 952,697,000 | 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 | $ 22,058,000 | $ (3,199,000) | $ 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 | 12.10% | 21.40% | 35.00% | |||||||||
| X | ||||||||||
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- Definition
Anticipated Timing of Inclusion of Costs in Amortization Calculation, Period No definition available.
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| X | ||||||||||
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- Definition
General and administrative costs capitalized to the full cost pool. No definition available.
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| X | ||||||||||
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- Definition
Cumulative capitalization of general and administrative costs incurred and capitalized to the full cost pool. No definition available.
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| X | ||||||||||
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- Definition
Number Of Advisors Allowed On Board Of Directors No definition available.
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| X | ||||||||||
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- Definition
Number Of Directors Allowed To Serve On Board Of Directors No definition available.
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| X | ||||||||||
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- Definition
Ownership Requirement To Meet Agreement No definition available.
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| X | ||||||||||
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- Definition
The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Balance held at close of period in number of shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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