Derivative Instruments (Schedule of Crude Oil Derivative Positions) (Details) - Crude Oil [Member]	Mar. 31, 2017 bbl / d $ / bbls
Swaps [Member] \| Q2 2017 [Domain]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	12,000
Weighted Average Floor Price ($/Bbls) \| $ / bbls	50.13
Swaps [Member] \| Q3 2017 [Domain]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	6,000
Weighted Average Floor Price ($/Bbls) \| $ / bbls	54.15
Swaps [Member] \| Q4 2017 [Domain]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	3,000
Weighted Average Floor Price ($/Bbls) \| $ / bbls	55.01
Energy Related Derivative, Weighted Average Ceiling Price of $60.00 [Member] \| FY 2018 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	2,488
Weighted Average Ceiling Price ($/Bbls) \| $ / bbls	60.00
Energy Related Derivative, Weighted Average Ceiling Price of $75.00 [Member] \| FY 2018 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	900
Weighted Average Ceiling Price ($/Bbls) \| $ / bbls	75.00
Energy Related Derivative, Weighted Average Ceiling Price of $62.50 [Member] \| FY 2019 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	2,975
Weighted Average Ceiling Price ($/Bbls) \| $ / bbls	62.50
Energy Related Derivative, Weighted Average Ceiling Price of $77.50 [Member] \| FY 2019 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	900
Weighted Average Ceiling Price ($/Bbls) \| $ / bbls	77.50
Energy Related Derivative, Weighted Average Ceiling Price of $65.00 [Member] \| FY 2020 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	3,675
Weighted Average Ceiling Price ($/Bbls) \| $ / bbls	65.00
Energy Related Derivative, Weighted Average Ceiling Price of $80.00 [Member] \| FY 2020 [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount \| bbl / d	900
Weighted Average Ceiling Price ($/Bbls) \| $ / bbls	80.00

- 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

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

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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

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- Definition

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+ References

No definition available.

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