- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix:	us-gaap_
Data Type:	num:energyItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix:	us-gaap_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

- Definition

Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in energy volume but not the derivative contract itself.

+ References

No definition available.

+ Details

Name:	us-gaap_UnderlyingDerivativeEnergyMeasure
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Definition

Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in volume but not the derivative contract itself.

+ References

No definition available.

+ Details

Name:	us-gaap_UnderlyingDerivativeVolume
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	este_DerivativeContractualPeriodAxis=este_DerivativeContractualPeriodFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

Name:	us-gaap_ReserveQuantitiesByTypeOfReserveAxis=us-gaap_NaturalGasReservesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	este_DerivativeContractualPeriodAxis=este_DerivativeContractualPeriodSixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_EnergyAxis=us-gaap_CrudeOilMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	este_DerivativeContractualPeriodAxis=este_DerivativeContractualPeriodSeventhMember
Namespace Prefix:
Data Type:	na
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- Details

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- Details

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- Details

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- Details

Name:	us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis=este_DerivativeContractualPeriodFourMember
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Derivative Financial Instruments - Schedule of Open Crude Oil and Natural Gas Derivative Contracts (Details) - Swap [Member]	1 Months Ended		12 Months Ended
	Mar. 31, 2016 MMBTU $ / bbl $ / MMBTU bbl	Jan. 31, 2016 MMBTU $ / bbl $ / MMBTU bbl	Dec. 31, 2015 $ / bbl bbl
February 2016 - December 2016 [Member] \| Natural Gas [Member] \| Scenario Forecast [Member]
Derivative [Line Items]
Volume in MMBtu \| MMBTU	770,000
Fixed Price, MMBtu \| $ / MMBTU	2.53
January 2017 - December 2017 [Member] \| Natural Gas [Member] \| Scenario Forecast [Member]
Derivative [Line Items]
Volume in MMBtu \| MMBTU	480,000
Fixed Price, MMBtu \| $ / MMBTU	2.785
Subsequent Event [Member] \| February 2016 - December 2016 [Member] \| Natural Gas [Member]
Derivative [Line Items]
Volume in MMBtu \| MMBTU		770,000
Fixed Price, MMBtu \| $ / MMBTU		2.53
Subsequent Event [Member] \| January 2017 - December 2017 [Member] \| Natural Gas [Member]
Derivative [Line Items]
Volume in MMBtu \| MMBTU		480,000
Fixed Price, MMBtu \| $ / MMBTU		2.785
Crude Oil \| April 2016 - March 2017 [Member] \| Scenario Forecast [Member]
Derivative [Line Items]
Volume in Bbls \| bbl	120,000
Fixed Price, Bbls \| $ / bbl	42.30
Crude Oil \| Subsequent Event [Member] \| April 2016 - March 2017 [Member]
Derivative [Line Items]
Volume in Bbls \| bbl		120,000
Fixed Price, Bbls \| $ / bbl		42.30
January 2016 - March 2016 [Member] \| Crude Oil
Derivative [Line Items]
Volume in Bbls \| bbl			15,000
Fixed Price, Bbls \| $ / bbl			57.00
January 2016 - June 2016 [Member] \| Crude Oil
Derivative [Line Items]
Volume in Bbls \| bbl			60,000
Fixed Price, Bbls \| $ / bbl			58.00
January 2016 - December 2016 [Member] \| Crude Oil
Derivative [Line Items]
Volume in Bbls \| bbl			60,000
Fixed Price, Bbls \| $ / bbl			60.80
January 2016 - December 2016 [Member] \| Crude Oil
Derivative [Line Items]
Volume in Bbls \| bbl			60,000
Fixed Price, Bbls \| $ / bbl			60.80