Common Stock	9 Months Ended
Sep. 30, 2019
Equity [Abstract]
Common Stock	Common Stock Class A Common Stock At September 30, 2019 and December 31, 2018, there were 29,150,220 and 28,696,321 shares of Class A Common Stock issued and outstanding, respectively. During the three and nine months ended September 30, 2019, as a result of the vesting and settlement of restricted stock units under the Earthstone Energy, Inc. Amended and Restated 2014 Long-Term Incentive Plan (the "2014 Plan"), Earthstone issued 167,827 and 569,883 shares, respectively, of Class A Common Stock, of which 49,111 and 151,716 shares, respectively, of Class A Common Stock were retained as treasury stock and canceled to satisfy the related employee income tax liability. During the three and nine months ended September 30, 2018, as a result of the vesting and settlement of restricted stock units under the 2014 Plan, Earthstone issued 115,574 and 569,585 shares, respectively, of Class A Common Stock, of which 30,511 and 142,937 shares, respectively, of Class A Common Stock were retained as treasury stock and canceled to satisfy the related employee income tax liability. Class B Common Stock At September 30, 2019 and December 31, 2018, there were 35,416,446 and 35,452,178 shares of Class B Common Stock issued and outstanding, respectively. Each share of Class B Common Stock, together with one EEH Unit, is convertible into one share of Class A Common Stock. No shares were converted during the three months ended September 30, 2019. During the nine months ended September 30, 2019, 35,732 shares of Class B Common Stock and EEH Units were exchanged for an equal number of shares of Class A Common Stock. During the three and nine months ended September 30, 2018, 183,894 and 389,135 shares, respectively, of Class B Common Stock and EEH Units were exchanged for an equal number of shares of Class A Common Stock.

Common Stock

Class A Common Stock

At September 30, 2019 and December 31, 2018, there were 29,150,220 and 28,696,321 shares of Class A Common Stock issued and outstanding, respectively. During the three and nine months ended September 30, 2019, as a result of the vesting and settlement of restricted stock units under the Earthstone Energy, Inc. Amended and Restated 2014 Long-Term Incentive Plan (the "2014 Plan"), Earthstone issued 167,827 and 569,883 shares, respectively, of Class A Common Stock, of which 49,111 and 151,716 shares, respectively, of Class A Common Stock were retained as treasury stock and canceled to satisfy the related employee income tax liability. During the three and nine months ended September 30, 2018, as a result of the vesting and settlement of restricted stock units under the 2014 Plan, Earthstone issued 115,574 and 569,585 shares, respectively, of Class A Common Stock, of which 30,511 and 142,937 shares, respectively, of Class A Common Stock were retained as treasury stock and canceled to satisfy the related employee income tax liability.

Class B Common Stock

At September 30, 2019 and December 31, 2018, there were 35,416,446 and 35,452,178 shares of Class B Common Stock issued and outstanding, respectively. Each share of Class B Common Stock, together with one EEH Unit, is convertible into one share of Class A Common Stock. No shares were converted during the three months ended September 30, 2019. During the nine months ended September 30, 2019, 35,732 shares of Class B Common Stock and EEH Units were exchanged for an equal number of shares of Class A Common Stock. During the three and nine months ended September 30, 2018, 183,894 and 389,135 shares, respectively, of Class B Common Stock and EEH Units were exchanged for an equal number of shares of Class A Common Stock.