Commodity Price Risk Activities - Schedule of Commodity Derivative Contracts (Details)	6 Months Ended
Jun. 30, 2018 MMBTU $ / MMBTU $ / bbl bbl
Oil -WTI Swaps July-December 2018
Derivative [Line Items]
Total Volume \| bbl	6,689
Weighted Average Price - Swap	56.45
Oil -WTI 2-Way Collar July-December 2018
Derivative [Line Items]
Total Volume \| bbl	500
Weighted Average Price - Floor	50
Weighted Average Price - Ceiling	59.45
Oil -WTI Swaps January-December 2019
Derivative [Line Items]
Total Volume \| bbl	4,930
Weighted Average Price - Swap	51.21
Oil -WTI Swaps January-December 2020
Derivative [Line Items]
Total Volume \| bbl	1,684
Weighted Average Price - Swap	53.02
Natural Gas - Henry Hub Swaps July-December 2018
Derivative [Line Items]
Total Energy \| MMBTU	7,393
Weighted Average Price - Swap \| $ / MMBTU	3.05

- Definition

The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageCapPrice
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeAverageFloorPrice
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- 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

Fixed price related to the price risk swap derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeSwapTypeFixedPrice
Namespace Prefix:	us-gaap_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=lone_OilWTISwapsJulyToDecemberTwoThousandEighteenMember
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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=lone_OilWTITwoWayCollarJulyToDecemberTwoThousandEighteenMember
Namespace Prefix:
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- Details

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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=lone_OilWTISwapsJanuaryToDecemberTwoThousandTwentyMember
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Data Type:	na
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- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=lone_NaturalGasHenryHubSwapsJulyToDecemberTwoThousandEighteenMember
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