Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Oct. 29, 2020
Document Information [Line Items]
Entity Central Index Key	0000010254
Entity Registrant Name	EARTHSTONE ENERGY INC
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2020
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-35049
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	84-0592823
Entity Address, Address Line One	1400 Woodloch Forest Drive, Suite 300
Entity Address, City or Town	The Woodlands
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77380
City Area Code	281
Local Phone Number	298-4246
Title of 12(b) Security	Class A Common Stock, $0.001 par value per share
Trading Symbol	ESTE
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		35,009,371
Common Class A [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		30,210,749