Derivative Financial Instruments (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 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	$ 3,346	$ 5,424	$ 7,781	$ (1,322)
Unrealized gain (loss) on derivatives	9,847	(21,337)	(29,715)	(9,492)
Total	13,193	(15,913)	(21,934)	(10,814)
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	3,346	5,424	7,781	(1,322)
Unrealized gain (loss) on derivatives	9,847	(21,337)	(29,715)	(9,492)
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	2,856	5,424	7,387	(1,373)
Unrealized gain (loss) on derivatives	10,379	(21,240)	(29,699)	(8,284)
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	490	0	394	51
Unrealized gain (loss) on derivatives	$ (532)	$ (97)	$ (16)	$ (1,208)