Derivative Financial Instruments (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	$ (1,843)	$ 392
Unrealized gain (loss) on derivatives	(3,108)	(4,825)
Total	(4,951)	(4,433)
Revenues [Member]
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	(1,843)	392
Unrealized gain (loss) on derivatives	(3,108)	(4,825)
Oil [Member] | Revenues [Member]
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	(942)	(237)
Unrealized gain (loss) on derivatives	(2,050)	(2,728)
Natural Gas [Member] | Revenues [Member]
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	(589)	524
Unrealized gain (loss) on derivatives	(1,267)	(2,511)
NGL's [Member] | Revenues [Member]
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	(312)	105
Unrealized gain (loss) on derivatives	$ 209	$ 414