Net (Loss) Income Per Common Share - Reconciliation of Net Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income (loss) attributable to Earthstone Energy, Inc.	$ (17,204)	$ 5,321
Net (loss) income per common share attributable to Earthstone Energy, Inc.:
Basic (in dollars per share)	$ (0.60)	$ 0.19
Diluted (in dollars per share)	$ (0.60)	$ 0.19
Weighted average common shares outstanding
Basic (in shares)	28,719,542	27,783,805
Add potentially dilutive securities:
Unvested restricted stock units (in shares)	0	128,119
Diluted weighted average common shares outstanding (in shares)	28,719,542	27,911,924

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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