Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain (loss) on derivatives	$ 558	$ 2,465	$ (1,661)	$ 9,528
Unrealized gain (loss) on derivatives	13,190	(26,625)	33,821	(33,464)
Total	13,748	(24,160)	32,160	(23,936)
Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain (loss) on derivatives	558	2,465	(1,661)	9,528
Unrealized gain (loss) on derivatives	13,190	(26,625)	33,821	(33,464)
Oil | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain (loss) on derivatives	581	561	(1,053)	6,024
Unrealized gain (loss) on derivatives	10,643	(19,319)	28,422	(26,974)
Natural Gas | Revenues
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain (loss) on derivatives	(23)	1,904	(608)	3,504
Unrealized gain (loss) on derivatives	$ 2,547	$ (7,306)	$ 5,399	$ (6,490)