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Property Acquisition and Operating Leases (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified |
1 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Feb. 28, 2011
Permian Basin [Member]
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Jun. 30, 2012
Permian Basin [Member]
|
Jun. 30, 2012
Permian Basin [Member]
|
Jun. 30, 2012
Northern portion of Midland Basin [Member]
Borden County Acreage Purchase [Member]
|
Feb. 28, 2012
Northern portion of Midland Basin [Member]
Borden County Acreage Purchase [Member]
acre
|
Jun. 30, 2012
Early Termination Provision if Sub Lessor is Found [Member]
Permian Basin [Member]
|
Jul. 05, 2012
Property Acquisitions [Member]
Southern Reagan County, Texas [Member]
acre
|
Jul. 05, 2012
Property Acquisitions [Member]
Southern Reagan County, Texas [Member]
Wolfcamp B [Member]
Drill_Location
|
Jul. 05, 2012
Property Acquisitions [Member]
Southern Reagan County, Texas [Member]
Sprayberry [Member]
Vertical_Well
|
Aug. 03, 2012
Property Acquisitions [Member]
Northern portion of Midland Basin [Member]
acre
|
Jul. 05, 2012
Producing Wells [Member]
Property Acquisitions [Member]
Southern Reagan County, Texas [Member]
Sprayberry [Member]
Vertical_Well
|
Jul. 05, 2012
Wells Awaiting Completion [Member]
Property Acquisitions [Member]
Southern Reagan County, Texas [Member]
Sprayberry [Member]
Vertical_Well
|
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| Significant Acquisitions [Line Items] | ||||||||||||
| Acquired acreage, undeveloped, gross (in acreas) | 16,020 | 2,319 | 3,586 | |||||||||
| Acquired acreage, undeveloped, net (in acres) | 14,470 | 1,762 | 2,732 | |||||||||
| Business Acquisition, Cost of Acquired Entity, Cash Paid | $ 15,000 | |||||||||||
| Average working interest across contiguous acreage position (as a percent) | 90.00% | |||||||||||
| Business Acquisition, Cost of Acquired Entity, Purchase Price | 12,000 | 1,770 | ||||||||||
| Number of added horizontal drilling locations (in drilling locations) | 19 | |||||||||||
| Number of vertical wells (in vertical wells) | 7 | 5 | 2 | |||||||||
| Business acqusition, Deposit Paid Prior to Closing Costs | 1,200 | |||||||||||
| Property | ||||||||||||
| Operating lease payments | 1,956 | 1,956 | ||||||||||
| Contracted drilling rig, term (in years) | 2 years | |||||||||||
| Operating Leases, Future Minimum Payments Due | ||||||||||||
| Lease payments in 2012 | 6,611 | 6,611 | 4,434 | |||||||||
| Lease payments in 2013 | 9,234 | 9,234 | 5,475 | |||||||||
| Lease payments in 2014 | $ 2,606 | $ 2,606 | $ 1,350 | |||||||||