Debt instrument expanded borrowing base.

No definition available.

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Namespace Prefix:	lone_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt instrument maturity period.

+ References

No definition available.

+ Details

Name:	lone_DebtInstrumentMaturityPeriod
Namespace Prefix:	lone_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument redemption period.

+ References

No definition available.

+ Details

Name:	lone_DebtInstrumentRedemptionPeriod
Namespace Prefix:	lone_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Payment of principal, interest and prepayment premium.

+ References

No definition available.

+ Details

Name:	lone_PaymentOfPrincipalInterestAndPrepaymentPremium
Namespace Prefix:	lone_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Description of debt redemption features under terms of the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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

- Definition

Start date of debt instrument redemption period, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPeriodStartDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of principal amount of debt redeemed.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value amount of debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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Period Type:	duration

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- Details

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- Details

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- Details

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- Details

Name:	us-gaap_DebtInstrumentAxis=lone_ElevenPointTwoFiveZeroPercentageSeniorNotesDueJanuaryFirstTwoThousandAndTwentyThreeMember
Namespace Prefix:
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- Details

Name:	us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix:
Data Type:	na
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- Details

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Namespace Prefix:
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- Details

Name:	us-gaap_DebtInstrumentAxis=lone_SeniorSecuredCreditFacilityMember
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Subsequent Events - Additional Information (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Jan. 04, 2018	Jan. 31, 2018	Dec. 31, 2017	Jun. 15, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Debt instrument expanded borrowing base			$ 160.0
Maximum
Subsequent Event [Line Items]
Debt instrument expanded borrowing base				$ 160.0
Minimum
Subsequent Event [Line Items]
Debt instrument expanded borrowing base				$ 112.0
Subsequent Event \| January 1, 2021
Subsequent Event [Line Items]
Redemption price, percentage	108.438%
Subsequent Event \| January 1, 2022
Subsequent Event [Line Items]
Redemption price, percentage	105.625%
Subsequent Event \| July 1, 2022
Subsequent Event [Line Items]
Redemption price, percentage	100.00%
11.25% Senior Notes \| Subsequent Event
Subsequent Event [Line Items]
Proceeds from issuance of senior notes	$ 250.0
Debt instrument interest rate	11.25%	11.25%
Senior notes maturity period	2023
Debt instrument maturity date	Jan. 01, 2023
Senior notes periodic payment terms	January 1 and July 1 of each year,
Senior notes beginning of first payment	Jul. 01, 2018
Senior notes redemption date	Jan. 01, 2021
Percentage of senior notes redeem from aggregate principal amount	65.00%
Redemption price, percentage	111.25%	11.25%
Senior notes redemption description	11.250% Senior Notes originally issued remains outstanding immediately after such redemption and the redemption occurs within 180 days of the closing date of such equity offering.
Credit facility, maturity date		Oct. 16, 2018
11.25% Senior Notes \| Subsequent Event \| Extended Maturity
Subsequent Event [Line Items]
Credit facility, maturity date		Jul. 28, 2020
11.25% Senior Notes \| Subsequent Event \| January 1, 2021
Subsequent Event [Line Items]
Percentage of senior notes redeem from aggregate principal amount	100.00%
11.25% Senior Notes \| Subsequent Event \| Maximum
Subsequent Event [Line Items]
Percentage of senior notes redeem from aggregate principal amount	35.00%
Senior notes redemption period	180 days
8.750% Senior Notes Due April 15, 2019
Subsequent Event [Line Items]
Debt instrument interest rate			8.75%		8.75%
Debt instrument repurchase amount					$ 68.2
Debt instrument maturity date			Apr. 15, 2019
8.750% Senior Notes Due April 15, 2019 \| Subsequent Event
Subsequent Event [Line Items]
Debt instrument interest rate	8.75%
Debt instrument repurchase amount	$ 244.4
Payment of principal, interest and prepayment premium	162.0
Senior Secured Credit Facility \| Subsequent Event
Subsequent Event [Line Items]
Debt instrument expanded borrowing base	$ 160.0