Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain on derivatives	$ 885	$ 19,862	$ 10,413	$ 52,146
Unrealized gain (loss) on derivatives	3,203	6,733	(30,261)	(25,356)
Total	4,088	26,595	(19,848)	26,790
Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain on derivatives	885	19,862	10,413	52,146
Unrealized gain (loss) on derivatives	3,203	6,733	(30,261)	(25,356)
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	837	17,056	6,861	42,013
Unrealized gain (loss) on derivatives	2,007	6,421	(24,967)	(19,923)
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	48	2,215	3,552	8,531
Unrealized gain (loss) on derivatives	1,196	808	(5,294)	(4,035)
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	591	0	1,602
Unrealized gain (loss) on derivatives	$ 0	$ (496)	$ 0	$ (1,398)