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Related Party Transactions (Details) (USD $)
|
3 Months Ended | 12 Months Ended | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Mar. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2012
Diamondback Energy, Inc [Member]
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Dec. 31, 2011
Diamondback Energy, Inc [Member]
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Dec. 31, 2012
Windsor Niobrara LLC [Member]
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Dec. 31, 2011
Windsor Niobrara LLC [Member]
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Dec. 31, 2012
Windsor Ohio LLC [Member]
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Dec. 31, 2011
Windsor Ohio LLC [Member]
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Dec. 31, 2012
Liddell [Member]
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Dec. 31, 2012
Rhino [Member]
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Dec. 31, 2011
Rhino [Member]
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Dec. 31, 2012
Athena [Member]
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Dec. 31, 2011
Athena [Member]
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Dec. 31, 2011
Directional [Member]
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Dec. 31, 2012
Black Fin [Member]
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Dec. 31, 2011
Black Fin [Member]
|
Dec. 31, 2012
Caliber [Member]
|
Dec. 31, 2011
Caliber [Member]
|
Dec. 31, 2012
Operating Lease Expense [Member]
Athena [Member]
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| Related Party Transaction [Line Items] | |||||||||||||||||||
| Due from (to) related party | $ (269,000) | $ (5,593,000) | $ 173,000 | $ 3,557,000 | $ 6,520,000 | $ 0 | $ 4,257,000 | $ 0 | $ (1,453,000) | $ (676,000) | $ (2,449,000) | $ 0 | $ (436,000) | $ (12,000) | $ (2,000) | ||||
| Lease operating expenses | 7,089,000 | 5,489,000 | 423,000 | 422,000 | |||||||||||||||
| Oil and natural gas properties | 40,354,000 | 50,614,000 | 5,009,000 | 2,851,000 | 6,068,000 | 650,000 | 436,000 | ||||||||||||
| Revenue from related parties | 7,545,000 | 6,642,000 | 163,650,000 | 93,871,000 | 2,020,000 | 4,443,000 | 25,862,000 | ||||||||||||
| Ownership percentage | 10.00% | ||||||||||||||||||
| Affiliates participation ratio | 50.00% | 50.00% | |||||||||||||||||
| Payments for ownership interest | 102,000 | ||||||||||||||||||
| General and administrative | $ 63,000 | $ 18,000 | |||||||||||||||||