Acquisitions - Pro Forma (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Business Combination and Asset Acquisition [Abstract]
Revenue	$ 115,331	$ 79,345	$ 316,932	$ 215,504
Income (loss) before taxes	22,647	(2,656)	17,660	49,461
Net income (loss)	22,196	(2,840)	18,003	48,962
Less: Net income (loss) attributable to noncontrolling interest	9,921	(1,182)	7,782	20,372
Net income (loss) attributable to Earthstone Energy, Inc.	$ 12,275	$ (1,658)	$ 10,222	$ 28,589
Basic (in dollars per share)	$ 0.25	$ (0.03)	$ 0.23	$ 0.59
Diluted (in dollars per share)	$ 0.23	$ (0.03)	$ 0.23	$ 0.59