Derivative Financial Instruments (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 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	$ (2,913)	$ 254	$ (4,756)	$ 646
Unrealized gain (loss) on derivatives	(5,234)	7,526	(8,342)	2,701
Total	(8,147)	7,780	(13,098)	3,347
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	(2,913)	254	(4,756)	646
Unrealized gain (loss) on derivatives	(5,234)	7,526	(8,342)	2,701
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	(2,764)	(228)	(3,706)	(465)
Unrealized gain (loss) on derivatives	(5,701)	4,042	(7,751)	1,314
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	(187)	105	(776)	629
Unrealized gain (loss) on derivatives	698	2,323	(569)	(189)
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	38	377	(274)	482
Unrealized gain (loss) on derivatives	$ (231)	$ 1,161	$ (22)	$ 1,576