The weighted average price for a series of crude oil derivative contracts.

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The weighted average price for a series of natural gas derivative contracts.

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This element reflects realized gain (loss) on the settlement of financial commodity derivative instruments.

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Percent of total receivables represented by amounts due from a single external customer.

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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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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.

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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.

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

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Nominal volume used to calculate payments on a derivative instrument.

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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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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period.

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Risk Management Activities (Details)	12 Months Ended
Risk Management Activities (Details)	Dec. 31, 2016 USD ($) $ / bbl $ / MMBTU MMBTU bbl	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net (Gains) Losses on Mark-to-Market Commodity Derivative Contracts \| $	$ 99,608,000	$ (61,924,000)	$ (834,273,000)
Net Cash Received from (Payments for) Settlements of Crude Oil and Natural Gas Derivative Contracts \| $	$ (22,219,000)	$ 730,114,000	$ 34,007,000
Derivative [Line Items]
Derivative, Average Floor Price	3.20
Derivatives, Fair Value [Line Items]
Receivable Major Customer Percentage		10.00%
Derivative liabilities, current \| $	$ 61,817,000	$ 0
Derivative Collateral [Abstract]
Collateral Held on Derivative \| $	0	0
Collateral Had on Derivaitve \| $	$ 0	0
Call Option [Member]
Derivative [Line Items]
Volume (MMBtud) \| MMBTU	106,250
Natural Gas Collar Contracts Year Two - March through November
Derivative [Line Items]
Volume (MMBtud) \| MMBTU	80,000
Derivative, Average Cap Price	3.69
Natural Gas Option Contracts Year Three - March through November \| Put Option [Member]
Derivative [Line Items]
Volume (MMBtud) \| MMBTU	96,000
Derivative, Average Price Risk Option Strike Price	2.94
Natural Gas Option Contracts Year Three - March through November \| Call Option [Member]
Derivative [Line Items]
Volume (MMBtud) \| MMBTU	120,000
Derivative, Average Price Risk Option Strike Price	3.38
Natural Gas Option Contracts Year Two - March through November \| Put Option [Member]
Derivative [Line Items]
Volume (MMBtud) \| MMBTU	171,000
Derivative, Average Price Risk Option Strike Price	2.92
Natural Gas Option Contracts Year Two - March through November \| Call Option [Member]
Derivative [Line Items]
Volume (MMBtud) \| MMBTU	213,750
Derivative, Average Price Risk Option Strike Price	3.44
Natural Gas Option Contracts - October through November (closed) \| Put Option [Member]
Derivative [Line Items]
Volume (MMBtud) \| MMBTU	0
Derivative, Average Price Risk Option Strike Price	0
Natural Gas Option Contracts - October through November (closed) \| Call Option [Member]
Derivative [Line Items]
Derivative, Average Price Risk Option Strike Price	3.48
Natural Gas Options Contracts September (closed) \| Put Option [Member]
Derivative [Line Items]
Volume (MMBtud) \| MMBTU	0
Derivative, Average Price Risk Option Strike Price	0
Natural Gas Options Contracts September (closed) \| Call Option [Member]
Derivative [Line Items]
Volume (MMBtud) \| MMBTU	56,250
Derivative, Average Price Risk Option Strike Price	3.46
Natural Gas Price Swap Contracts Year Two - March through November
Derivative [Line Items]
Volume (MMBtud) \| MMBTU	30,000
Derivative Weighted Average Price Natural Gas ($/MMBtu)	3.10
Natural Gas Price Swap Contracts - March through August (closed)
Derivative [Line Items]
Volume (MMBtud) \| MMBTU	60,000
Derivative Weighted Average Price Natural Gas ($/MMBtu)	2.49
Crude Oil Collar Contracts - September through December (closed)
Derivative [Line Items]
Volume (Bbld) \| bbl	70,000
Derivative, Average Cap Price \| $ / bbl	54.25
Derivative, Average Floor Price \| $ / bbl	45.00
Crude Oil Price Swap Contracts Year Two - January through June
Derivative [Line Items]
Volume (Bbld) \| bbl	35,000
Derivative Weighted Average Price Crude Oil ($/Bbl) \| $ / bbl	50.04
Crude Oil Price Swap Contracts May - June (closed)
Derivative [Line Items]
Volume (Bbld) \| bbl	128,000
Derivative Weighted Average Price Crude Oil ($/Bbl) \| $ / bbl	42.56
Crude Oil Price Swap Contracts - April (closed)
Derivative [Line Items]
Volume (Bbld) \| bbl	90,000
Derivative Weighted Average Price Crude Oil ($/Bbl) \| $ / bbl	42.30
Crude oil and natural gas derivative contracts - \| Liabilities From Price Risk Management Activities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, current \| $	$ 62,000,000	0
Crude oil and natural gas derivative contracts - \| Other Assets [Member]
Derivatives, Fair Value [Line Items]
Other Assets \| $	$ 1,000,000	$ 0