Derivative Instruments - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 08, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivatives, Fair Value [Line Items]
Gain or loss recognized in oil and gas contracts	$ 0	$ 0		$ 0
Gas hedges
Derivatives, Fair Value [Line Items]
Gain or loss recognized in oil and gas contracts			$ 0		$ 805,000
Oil hedges
Derivatives, Fair Value [Line Items]
Gain or loss recognized in oil and gas contracts			$ (307,000)		$ (571,000)