Fair Value Measurements (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets:
Commodities derivatives	$ 155,744
Liabilities:
Environmental liability	(2,088,158)	(2,100,000)
Asset retirement obligations (non-recurring)	(3,399,096)	(3,317,358)	(1,186,260)
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1)
Assets:
Commodities derivatives
Total
Liabilities:
Environmental liability
Asset retirement obligations (non-recurring)
Total
Significant or Other Observable Inputs (Level 2)
Assets:
Commodities derivatives	155,744	290,788
Total	155,744	290,788
Liabilities:
Environmental liability
Asset retirement obligations (non-recurring)
Total
Significant Unobservable Inputs (Level 3)
Assets:
Commodities derivatives
Total
Liabilities:
Environmental liability	(2,088,158)	(2,100,000)
Asset retirement obligations (non-recurring)	(3,399,096)	(3,317,358)
Total	(5,487,254)	(5,417,358)
Fair Value
Assets:
Commodities derivatives	155,744	290,788
Total	155,744	290,788
Liabilities:
Environmental liability	(2,088,158)	(2,100,000)
Asset retirement obligations (non-recurring)	(3,399,096)	(3,317,358)
Total	$ (5,487,254)	$ (5,417,358)