XML 62 R50.htm IDEA: XBRL DOCUMENT v3.19.1

Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Details) $ in Thousands	1 Months Ended	3 Months Ended
	May 08, 2019 MMBTU $ / bbl bbl	Mar. 31, 2019 USD ($) MMBTU $ / bbl $ / MMBTU bbl
Derivative [Line Items]
Fair value assets (liabilities) | $		$ (24,286)
NYMEX WTI | Crude Oil | 2019 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		3,881,000
Average swap price (in dollars per barrel)		54.02
Fair value assets (liabilities) | $		$ (23,216)
NYMEX WTI | Crude Oil | 2019 Two-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		3,542,000
Average floor price (in dollars per barrel)		57.65
Average ceiling price (in dollars per barrel)		74.72
Fair value assets (liabilities) | $		$ 5,381
NYMEX WTI | Crude Oil | 2019 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		3,300,000
Average sub-floor price (in dollars per barrel)		40.37
Average floor price (in dollars per barrel)		51.43
Average ceiling price (in dollars per barrel)		66.81
Fair value assets (liabilities) | $		$ (2,375)
NYMEX WTI | Crude Oil | 2020 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		829,000
Average swap price (in dollars per barrel)		56.60
Fair value assets (liabilities) | $		$ (2,363)
NYMEX WTI | Crude Oil | 2020 Two-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		372,000
Average floor price (in dollars per barrel)		58.08
Average ceiling price (in dollars per barrel)		76.05
Fair value assets (liabilities) | $		$ 1,270
NYMEX WTI | Crude Oil | 2020 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		1,712,000
Average sub-floor price (in dollars per barrel)		40.00
Average floor price (in dollars per barrel)		55.39
Average ceiling price (in dollars per barrel)		61.13
Fair value assets (liabilities) | $		$ (2,081)
NYMEX WTI | Crude Oil | 2021 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		124,000
Average sub-floor price (in dollars per barrel)		40.00
Average floor price (in dollars per barrel)		56.18
Average ceiling price (in dollars per barrel)		60.43
Fair value assets (liabilities) | $		$ (59)
NYMEX WTI | Subsequent Event | Crude Oil | 2019 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	4,952,000
Average swap price (in dollars per barrel)	56.15
NYMEX WTI | Subsequent Event | Crude Oil | 2019 Two-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	3,848,000
Average floor price (in dollars per barrel)	57.68
Average ceiling price (in dollars per barrel)	74.04
NYMEX WTI | Subsequent Event | Crude Oil | 2019 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	3,300,000
Average sub-floor price (in dollars per barrel)	40.37
Average floor price (in dollars per barrel)	51.43
Average ceiling price (in dollars per barrel)	66.81
NYMEX WTI | Subsequent Event | Crude Oil | 2020 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	2,171,000
Average swap price (in dollars per barrel)	59.09
NYMEX WTI | Subsequent Event | Crude Oil | 2020 Two-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	434,000
Average floor price (in dollars per barrel)	58.07
Average ceiling price (in dollars per barrel)	74.64
NYMEX WTI | Subsequent Event | Crude Oil | 2020 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	3,110,000
Average sub-floor price (in dollars per barrel)	40.00
Average floor price (in dollars per barrel)	54.79
Average ceiling price (in dollars per barrel)	63.75
NYMEX WTI | Subsequent Event | Crude Oil | 2021 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	93,000
Average swap price (in dollars per barrel)	58.85
NYMEX WTI | Subsequent Event | Crude Oil | 2021 Three-way collar
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	186,000
Average sub-floor price (in dollars per barrel)	40.00
Average floor price (in dollars per barrel)	54.96
Average ceiling price (in dollars per barrel)	62.31
ICE Brent-NYMEX WTI | Crude Oil | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		244,000
Average swap price (in dollars per barrel)		9.68
Fair value assets (liabilities) | $		$ 549
ICE Brent-NYMEX WTI | Subsequent Event | Crude Oil | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	244,000
ICE Brent-NYMEX WTI | Subsequent Event | Natural Gas | 2019 Basis swaps
Derivative [Line Items]
Average swap price (in dollars per barrel)	9.68
Midland-NYMEX WTI | Crude Oil | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		488,000
Average swap price (in dollars per barrel)		6.71
Fair value assets (liabilities) | $		$ (2,971)
Midland-NYMEX WTI | Subsequent Event | Crude Oil | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	488,000
Midland-NYMEX WTI | Subsequent Event | Natural Gas | 2019 Basis swaps
Derivative [Line Items]
Average swap price (in dollars per barrel)	6.71
Houston NYMEX WTI | Crude Oil | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl		549,000
Average swap price (in dollars per barrel)		4.55
Fair value assets (liabilities) | $		$ (305)
Houston NYMEX WTI | Subsequent Event | Crude Oil | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	549,000
Houston NYMEX WTI | Subsequent Event | Natural Gas | 2019 Basis swaps
Derivative [Line Items]
Average swap price (in dollars per barrel)	4.55
NYMEX HH | Natural Gas | 2019 Fixed price swaps
Derivative [Line Items]
Total notional amount of natural gas (in MMBtu) | MMBTU		8,796,000
Average swap price (in dollars per barrel) | $ / MMBTU		2.92
Fair value assets (liabilities) | $		$ 1,148
NYMEX HH | Subsequent Event | Natural Gas | 2019 Fixed price swaps
Derivative [Line Items]
Total notional amount of natural gas (in MMBtu) | MMBTU	8,796,000
Average swap price (in dollars per barrel)	2.92
IF NNG Ventura-NYMEX HH | Natural Gas | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of natural gas (in MMBtu) | MMBTU		2,275,000
Average swap price (in dollars per barrel)		0.02
Fair value assets (liabilities) | $		$ 736
IF NNG Ventura-NYMEX HH | Subsequent Event | Natural Gas | 2019 Basis swaps
Derivative [Line Items]
Total notional amount of natural gas (in MMBtu) | MMBTU	2,275,000
Average swap price (in dollars per barrel)	0.02

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:	dei_EntityListingsExchangeAxis=oas_NYMEXWTIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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_TwoThousandNineteenSwapsMember
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_DerivativeInstrumentRiskAxis=oas_TwoThousandTwentyOneThreeWayCollarsMember
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:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandTwentyOneFixedPriceSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_EntityListingsExchangeAxis=oas_NYMEXWTIICEBRENTMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=oas_TwoThousandNineteenBasisSwapsMember
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:	dei_EntityListingsExchangeAxis=oas_MidlandNYMEXWTIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_EntityListingsExchangeAxis=oas_HoustonNYMEXWTIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_EntityListingsExchangeAxis=oas_NYMEXHHMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_EntityListingsExchangeAxis=oas_IFNNGVENTURANYMEXMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: