Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized loss on derivatives	$ (4,258)	$ (2,219)
Unrealized gain on derivatives	10,416	20,631
Total	6,158	18,412
Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized loss on derivatives	(4,258)	(2,219)
Unrealized gain on derivatives	10,416	20,631
Oil | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized loss on derivatives	(4,309)	(1,635)
Unrealized gain on derivatives	11,127	17,780
Natural Gas | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized loss on derivatives	51	(584)
Unrealized gain on derivatives	$ (711)	$ 2,851