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Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Details) $ in Thousands | Mar. 31, 2016 USD ($) MBbls $ / bbl
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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)

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- 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 + Details
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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 + Details
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