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Commitments (Details) (USD $)
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0 Months Ended | 12 Months Ended | 12 Months Ended | 0 Months Ended | ||||||||||
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Nov. 02, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Mar. 31, 2013
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Mar. 31, 2013
Grizzly [Member]
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Dec. 31, 2012
Grizzly [Member]
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Oct. 05, 2012
Grizzly [Member]
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Dec. 31, 2012
Minimum [Member]
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Mar. 31, 2013
Executive Officer [Member]
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Dec. 31, 2012
Executive Officer [Member]
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Mar. 11, 1997
WCBB [Member]
wells
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Mar. 31, 2013
WCBB [Member]
wells
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Dec. 31, 2012
WCBB [Member]
wells
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| Commitments [Line Items] | ||||||||||||||
| Percentage of interest in WCBB | 50.00% | |||||||||||||
| Contribution to plugging and abandonment trust | $ 18,000 | |||||||||||||
| Annual minimum wells to be plugged | 20 | |||||||||||||
| Tenure of minimum wells to be plugged, years | 20 years | |||||||||||||
| Plugging and abandonment escrow account on the WCBB properties (Note 17) | 3,113,000 | 3,121,000 | 3,113,000 | |||||||||||
| Number of wells plugged | 354 | 354 | ||||||||||||
| Maximum annual contribution per employee (401K Plan) | 100.00% | |||||||||||||
| Miminum matching employer contribution for 401k | 3.00% | |||||||||||||
| Cost recognized on defined contribution plan | 361,000 | 310,000 | 316,000 | |||||||||||
| Employement agreement | 3 years | |||||||||||||
| Extension period | 1 year | |||||||||||||
| Notice period | 90 days | |||||||||||||
| Other Commitment | 7,600,000 | 7,050,000 | ||||||||||||
| Contractual obligation for future salaries and benefits | 12,400,000 | 6,300,000 | 8,500,000 | |||||||||||
| Contractual oblication in excess of | $ 2,000,000 | |||||||||||||