Risk Management Activities (Details)	6 Months Ended
Jun. 30, 2017 USD ($) MMBTU $ / bbl $ / MMBTU bbl	Dec. 31, 2016 USD ($)
Derivatives, Fair Value [Line Items]
Assets from Price Risk Management Activities \| $	$ 4,746,000	$ 0
Liabilities from Price Risk Management Activities \| $	0	61,817,000
Derivative Collateral [Abstract]
Collateral Held on Derivative \| $	0	0
Collateral Had on Derivative \| $	0	0
Assets [Member] \| Price Risk Derivative [Member]
Derivatives, Fair Value [Line Items]
Assets from Price Risk Management Activities \| $	5,000,000	0
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Other Assets \| $	3,000,000	1,000,000
Liability [Member] \| Price Risk Derivative [Member]
Derivatives, Fair Value [Line Items]
Liabilities from Price Risk Management Activities \| $	$ 0	$ 62,000,000
Crude Oil [Member] \| Basis Swaps [Member] \| Derivative Contracts Year Two - January through December [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	15,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	1.063
Crude Oil [Member] \| Basis Swaps [Member] \| Derivative Contracts Year Three January - December [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	20,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	1.075
Crude Oil [Member] \| Price Swaps [Member] \| Remaining Derivative Contracts - March through June [Member]
Derivatives, Fair Value [Line Items]
Derivative, Cash Received on Hedge \| $	$ 700,000
Volume (Bbld) \| bbl	5,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	50.00
Crude Oil [Member] \| Price Swaps [Member] \| Derivative 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 [Member] \| Price Swaps [Member] \| Crude Oil Derivative Contracts - March through June (closed) [Member]
Derivatives, Fair Value [Line Items]
Derivative, Cash Received for Early Termination on Hedge \| $	$ 4,600,000
Volume (Bbld) \| bbl	30,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	50.05
Crude Oil [Member] \| Price Swaps [Member] \| Crude Oil Price Swap Contracts - March through June (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) \| bbl	5,000
Derivative, Swap Type, Average Fixed Price \| $ / bbl	48.81
Natural Gas [Member] \| Price Swaps [Member] \| Derivative Contracts - March through July (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	30,000
Derivative, Swap Type, Average Fixed Price	3.10
Natural Gas [Member] \| Price Swaps [Member] \| Derivative Contracts - August through November [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	30,000
Derivative, Swap Type, Average Fixed Price	3.10
Natural Gas [Member] \| Price Swaps [Member] \| 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 [Member] \| Call Option [Member] \| Derivative Contracts - March through July (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	213,750
Derivative, Average Price Risk Option Strike Price	3.44
Natural Gas [Member] \| Call Option [Member] \| Derivative Contracts - August through November [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	213,750
Derivative, Average Price Risk Option Strike Price	3.44
Natural Gas [Member] \| Call Option [Member] \| 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
Natural Gas [Member] \| Put Option [Member] \| Derivative Contracts - March through July (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	171,000
Derivative, Average Price Risk Option Strike Price	2.92
Natural Gas [Member] \| Put Option [Member] \| Derivative Contracts - August through November [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) \| MMBTU	171,000
Derivative, Average Price Risk Option Strike Price	2.92
Natural Gas [Member] \| Put Option [Member] \| 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
Natural Gas [Member] \| Collars [Member] \| Derivative Contracts - March through July (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 [Member] \| Collars [Member] \| Derivative Contracts - August 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

The amount of cash received during the period for early termination of a hedge.

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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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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

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

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No definition available.

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

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No definition available.

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

+ References

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Nominal volume used to calculate payments on a derivative instrument.

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

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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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