XML 60 R46.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) MMBTU $ / bbl $ / MMBTU bbl | Jul. 31, 2018 $ / bbl
Derivative [Line Items] |  |
Fair value asset | $ | $ (229,792) |
Crude Oil [Member] | 2018 Swaps [Member] |  |
Derivative [Line Items] |  |
Total notional amount of oil (in Bbls) | bbl | 7,745,000 |
Average swap price (in dollars per barrel) | 53.02 |
Fair value asset | $ | $ (133,352) |
Crude Oil [Member] | 2018 Basis Swaps [Member] |  |
Derivative [Line Items] |  |
Total notional amount of oil (in Bbls) | bbl | 153,000 |
Average swap price (in dollars per barrel) | 10.50 |
Fair value asset | $ | $ 471 |
Crude Oil [Member] | 2018 Two-way Collars [Member] |  |
Derivative [Line Items] |  |
Total notional amount of oil (in Bbls) | bbl | 549,000 |
Average floor price (in dollars per barrel) | 48.67 |
Average ceiling price (in dollars per barrel) | 53.07 |
Fair value asset | $ | $ (9,479) |
Crude Oil [Member] | 2019 Swaps [Member] |  |
Derivative [Line Items] |  |
Total notional amount of oil (in Bbls) | bbl | 5,613,000 |
Average swap price (in dollars per barrel) | 53.33 |
Fair value asset | $ | $ (69,121) |
Crude Oil [Member] | 2019 Basis Swaps [Member] [Member] |  |
Derivative [Line Items] |  |
Total notional amount of oil (in Bbls) | bbl | 212,000 |
Average swap price (in dollars per barrel) | 10.50 |
Fair value asset | $ | $ 353 |
Crude Oil [Member] | 2019 Two-way Collars [Member] |  |
Derivative [Line Items] |  |
Total notional amount of oil (in Bbls) | bbl | 761,000 |
Average floor price (in dollars per barrel) | 52.03 |
Average ceiling price (in dollars per barrel) | 69.03 |
Fair value asset | $ | $ (2,500) |
Crude Oil [Member] | 2019 Three-way Collars [Member] |  |
Derivative [Line Items] |  |
Total notional amount of oil (in Bbls) | bbl | 3,368,000 |
Average sub-floor price (in dollars per barrel) | 40.54 |
Average floor price (in dollars per barrel) | 51.03 |
Average ceiling price (in dollars per barrel) | 68.68 |
Fair value asset | $ | $ (12,060) |
Crude Oil [Member] | 2020 Swaps [Member] |  |
Derivative [Line Items] |  |
Total notional amount of oil (in Bbls) | bbl | 403,000 |
Average swap price (in dollars per barrel) | 53.47 |
Fair value asset | $ | $ (3,557) |
Crude Oil [Member] | 2020 Two-way Collars [Member] |  |
Derivative [Line Items] |  |
Total notional amount of oil (in Bbls) | bbl | 62,000 |
Average floor price (in dollars per barrel) | 52.50 |
Average ceiling price (in dollars per barrel) | 71.25 |
Fair value asset | $ | $ (30) |
Crude Oil [Member] | 2020 Three-way Collars [Member] |  |
Derivative [Line Items] |  |
Total notional amount of oil (in Bbls) | bbl | 279,000 |
Average sub-floor price (in dollars per barrel) | 40.00 |
Average floor price (in dollars per barrel) | 50.56 |
Average ceiling price (in dollars per barrel) | 67.80 |
Fair value asset | $ | $ (876) |
Natural Gas [Member] | 2018 Swaps [Member] |  |
Derivative [Line Items] |  |
Total notional amount of natural gas (in MMBtu) | MMBTU | 6,440,000 |
Average swap price (in dollars per barrel) | $ / MMBTU | 3.02 |
Fair value asset | $ | $ 403 |
Natural Gas [Member] | 2018 Basis Swaps [Member] |  |
Derivative [Line Items] |  |
Total notional amount of natural gas (in MMBtu) | MMBTU | 1,220,000 |
Natural Gas [Member] | 2019 Swaps [Member] |  |
Derivative [Line Items] |  |
Total notional amount of natural gas (in MMBtu) | MMBTU | 1,353,000 |
Average swap price (in dollars per barrel) | $ / MMBTU | 2.96 |
Fair value asset | $ | $ (44) |
Natural Gas [Member] | 2019 Basis Swaps [Member] [Member] |  |
Derivative [Line Items] |  |
Total notional amount of natural gas (in MMBtu) | MMBTU | 1,810,000 |
Subsequent Event [Member] | Natural Gas [Member] |  |
Derivative [Line Items] |  |
Average swap price (in dollars per barrel) |  | 0.06

X
- Definition Derivative, Sub-Floor Price + References No definition available. + Details
Name: | oas_DerivativeSubFloorPrice
Namespace Prefix: | oas_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- 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

X
- 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

X
- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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

X
- 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

X
- 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

X
- Definition Average fixed price related to the group of price risk swap derivatives. + References No definition available. + Details
Name: | us-gaap_DerivativeSwapTypeAverageFixedPrice
Namespace Prefix: | us-gaap_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

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

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandEighteenSwapsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandEighteenBasisSwapsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandEighteenTwoWayCollarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandNineteenSwapsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandNineteenBasisSwapsMemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandNineteenTwowayCollarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandNineteenThreeWayCollarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandTwentySwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandTwentyTwoWayCollarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandTwentyThreeWayCollarsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EnergyAxis=srt_NaturalGasReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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