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Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Details) $ in Thousands	Mar. 31, 2016 USD ($) MBbls $ / bbl
Derivative [Line Items]
Fair value asset (liability) | $	$ 96,535
2016 Swaps [Member]
Derivative [Line Items]
Total notional amount of oil (in MBbls) | MBbls	8,707
Average swap price (in dollars per barrel)	50.60
Fair value asset (liability) | $	$ 82,960
2017 Swaps [Member]
Derivative [Line Items]
Total notional amount of oil (in MBbls) | MBbls	3,967
Average swap price (in dollars per barrel)	48.01
Fair value asset (liability) | $	$ 13,906
2017 Two Way Collars [Member]
Derivative [Line Items]
Total notional amount of oil (in MBbls) | MBbls	668
Average floor price (in dollars per barrel)	40.00
Average ceiling price (in dollars per barrel)	47.58
Fair value asset (liability) | $	$ (638)
2018 Swaps [Member]
Derivative [Line Items]
Total notional amount of oil (in MBbls) | MBbls	279
Average swap price (in dollars per barrel)	47.61
Fair value asset (liability) | $	$ 433
2018 Two Way Collars [Member]
Derivative [Line Items]
Total notional amount of oil (in MBbls) | MBbls	62
Average floor price (in dollars per barrel)	40.00
Average ceiling price (in dollars per barrel)	47.58
Fair value asset (liability) | $	$ (126)

X

- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- 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

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- 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.

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- 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611

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- 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.

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- Definition

Average fixed price related to the group of price risk swap derivatives.

+ References

No definition available.

+ Details

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