Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Summary of location and aggregate fair value of all derivative financial instruments recorded in the consolidated statements of operations
Realized gain (loss) on derivatives	$ 1,165	$ (2,488)	$ 4,435	$ (6,746)
Unrealized gain (loss) on derivatives	6,157	1,429	(39,562)	11,845
Total	7,322	(1,059)	(35,127)	5,099
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	1,165	(2,488)	4,435	(6,746)
Unrealized gain (loss) on derivatives	6,157	1,429	(39,562)	11,845
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	1,165	(2,488)	4,531	(6,797)
Unrealized gain (loss) on derivatives	5,365	1,829	(40,078)	12,956
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	0	0	(96)	51
Unrealized gain (loss) on derivatives	$ 792	$ (400)	$ 516	$ (1,111)