Derivative Instruments (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Effect of derivative contracts on Consolidated Statements of Operations
Realized gain	$ 6,965,808	$ 6,086,840	$ 16,317,591
Unrealized gain (loss)	(2,288,189)	454,906	(6,500,825)
Interest rate contracts
Effect of derivative contracts on Consolidated Statements of Operations
Unrealized gain (loss)		1,392,740	3,217,729
Interest rate contracts | Interest expense
Effect of derivative contracts on Consolidated Statements of Operations
Realized gain		(1,410,764)	(4,594,968)
Crude oil contract
Effect of derivative contracts on Consolidated Statements of Operations
Unrealized gain (loss)	1,483,337	2,699,354	(1,477,423)
Crude oil contract | Crude oil sales
Effect of derivative contracts on Consolidated Statements of Operations
Realized gain	1,093,148	(3,531,207)	1,446,686
Natural gas reserves contract
Effect of derivative contracts on Consolidated Statements of Operations
Unrealized gain (loss)	(3,771,526)	(3,637,188)	(8,241,131)
Natural gas reserves contract | Natural gas reserves sales
Effect of derivative contracts on Consolidated Statements of Operations
Realized gain	5,872,660	11,283,031	19,465,873
Natural gas liquids reserves contract | Natural gas liquids reserves sales
Effect of derivative contracts on Consolidated Statements of Operations
Realized gain		$ (254,220)