Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	$ (2,219)	$ 7,063
Unrealized gain (loss) on derivatives	20,631	(6,839)
Total	18,412	224
Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	(2,219)	7,063
Unrealized gain (loss) on derivatives	20,631	(6,839)
Oil | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	(1,635)	5,464
Unrealized gain (loss) on derivatives	17,780	(7,654)
Natural Gas | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized (loss) gain on derivatives	(584)	1,599
Unrealized gain (loss) on derivatives	$ 2,851	$ 815