|
Fair Value Measurements Fair Value Measurements (Fair Value of Liabilities Measured on Nonrecurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | 3 Months Ended | |||||
|---|---|---|---|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Jun. 30, 2013
Southern Portion of Midland Basin [Member]
bbl
Oil_well
acre
|
Jun. 30, 2013
Reagan and Upton Counties Acreage Purchase [Member]
|
Jun. 30, 2013
Reagan and Upton Counties Acreage Purchase, Unevaluated [Member]
|
Jun. 30, 2013
Reagan and Upton Counties Acreage Purchase, Evaluated [Member]
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||||||
| Loss on Sale of Assets and Asset Impairment Charges | $ 1,707 | $ 1,177 | $ 0 | ||||
| Gas and Oil Area, Developed, Gross | 2,468 | ||||||
| Gas and Oil Area, Developed, Net | 2,186 | ||||||
| Business Combination, Consideration Transferred | 11,000 | ||||||
| Productive Oil Wells, Number of Wells, Gross | 7 | ||||||
| Proved Developed Reserves (Volume) | 1,301,000 | ||||||
| Business Combination, Consideration Transferred | $ 11,000 | $ 2,000 | $ 9,000 | ||||
| X | ||||||||||
|
- Definition
Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value. No definition available.
|
| X | ||||||||||
|
- Definition
Area spaced or assigned to productive wells in which a working interest is owned. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Fractional interest owned based on working interests or other economic arrangements of area spaced or assigned to productive wells. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The total number of producing oil wells and oil wells capable of production, in which the entity owns an undivided working interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Net quantities of an enterprise's interests in proved developed reserves of either crude oil (including condensate and natural gas liquids), natural gas, synthetic oil and gas, or other nonrenewable natural resource that is intended to be upgraded into synthetic oil and gas as of the beginning and the end of the year. "Net" quantities of reserves include those relating to the enterprise's operating and nonoperating interests in properties. Quantities of reserves relating to royalty interests owned are included in "net" quantities if the necessary information is available to the enterprise. "Net" quantities does not include reserves relating to interests of others in properties owned by the enterprise. The unit of measure for reserve quantities is defined as "barrels" for oil and synthetic oil reserves or "cubic feet" or "cubic meters" for natural gas and synthetic gas reserves. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|