Risk Management Activities (Details)	3 Months Ended
Mar. 31, 2017 USD ($) MMBTU $ / bbl $ / MMBTU bbl	Dec. 31, 2016 USD ($)
Derivatives, Fair Value [Line Items]
Derivative, Cash Received on Hedge \| $	$ 4,600,000
Derivative, Cash to be Received on Hedge \| $	700,000
Derivative Liabilities, Current \| $	7,636,000	$ 61,817,000
Derivative Assets, Current \| $	1,142,000	0
Derivative Collateral [Abstract]
Collateral Held on Derivative \| $	0	0
Collateral Had on Derivative \| $	$ 0	0
Remaining Crude Oil Derivative Contracts - March through June [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	5,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	50.00
Crude Oil Derivative Contracts March - June (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	5,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	48.81
Crude Oil Price Swap Contracts - January through February (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	35,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	50.04
Crude Oil Price Swap Contracts - March through June (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	30,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	50.05
Natural Gas Price Swap Contracts - March through April (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	30,000
Derivative, Swap Type, Average Fixed Price	3.10
Natural Gas Derivative Contracts May through November [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	30,000
Derivative, Swap Type, Average Fixed Price	3.10
Natural Gas Derivative Contracts Year Two - March through November [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	35,000
Derivative, Swap Type, Average Fixed Price	3.00
Natural Gas Collar Contracts - March through April (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	80,000
Derivative, Average Cap Price	3.69
Derivative, Average Floor Price	3.20
Natural Gas Collar Contracts - May through November [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	80,000
Derivative, Average Cap Price	3.69
Derivative, Average Floor Price	3.20
Call Option [Member] \| Natural Gas Option Contracts March through April (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	213,750
Derivative, Average Price Risk Option Strike Price	3.44
Call Option [Member] \| Natural Gas Option Contracts - May through November [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	213,750
Derivative, Average Price Risk Option Strike Price	3.44
Call Option [Member] \| Natural Gas Derivative Contracts Year Two - March through November [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	120,000
Derivative, Average Price Risk Option Strike Price	3.38
Put Option [Member] \| Natural Gas Option Contracts March through April (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	171,000
Derivative, Average Price Risk Option Strike Price	2.92
Put Option [Member] \| Natural Gas Option Contracts - May through November [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	171,000
Derivative, Average Price Risk Option Strike Price	2.92
Put Option [Member] \| Natural Gas Derivative Contracts Year Two - March through November [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	96,000
Derivative, Average Price Risk Option Strike Price	2.94
Liabilities From Price Risk Management Activities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities, Current \| $	$ 7,000,000	62,000,000
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Other Assets \| $	5,000,000	1,000,000
Assets From Price Risk Management Activities [Member]
Derivatives, Fair Value [Line Items]
Derivative Assets, Current \| $	$ 1,000,000	$ 0

The amount of cash to be received during the period on settlement of a hedge.

No definition available.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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-Name Accounting Standards Codification
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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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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.

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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

The average strike price on the group of price risk option contracts such as put options or call options.

+ References

No definition available.

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- Definition

The amount of cash received during the period on settlement of a hedge.

+ References

No definition available.

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- References

No definition available.

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- Definition

Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

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Nominal volume used to calculate payments on a derivative instrument.

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- Definition

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

+ References

No definition available.

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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.

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