Net Income (Loss) Per Common Share - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income (loss) attributable to noncontrolling interest	$ 340,000	$ 2,452,000	$ 8,032,000	$ (35,392,000)
Dilutive effect on Net income (loss) per common share attributable to Earthstone Energy, Inc	$ 0		$ 0