Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain on derivatives	$ 7,063	$ 18,504
Unrealized loss on derivatives	(6,839)	(8,557)
Total	224	9,947
Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain on derivatives	7,063	18,504
Unrealized loss on derivatives	(6,839)	(8,557)
Oil | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain on derivatives	5,464	14,433
Unrealized loss on derivatives	(7,654)	(6,464)
Natural Gas | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain on derivatives	1,599	3,600
Unrealized loss on derivatives	815	(1,563)
Natural Gas Liquids | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain on derivatives	0	471
Unrealized loss on derivatives	$ 0	$ (530)