Derivative Instruments and Fair Value Measurements - Use of Derivative Instruments (Details) - Commodity Contract bbl in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2017 USD ($) barrel_of_oil_per_day contract bbl	Dec. 31, 2016 USD ($) barrel_of_oil_per_day contract bbl
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Number of contracts held \| contract	8	2
July 2017 through October 2017 [Member]
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Volume committed per day under commodity purchase and sale contract \| barrel_of_oil_per_day	97
November 2017 through January 2018 [Member]
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Volume committed per day under commodity purchase and sale contract \| barrel_of_oil_per_day	65
April 2017 Through May 2017
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Total volume committed under commodity purchase and sale contract \| bbl	145
January 2017 Through April 2017
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Volume committed per day under commodity purchase and sale contract \| barrel_of_oil_per_day		65
Total volume committed under commodity purchase and sale contract \| bbl		145
Not Designated as Hedging Instrument \| Current Assets
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Asset Derivatives	$ 1,182	$ 378
Liability Derivatives	0	0
Less Counterparty Offsets	(400)	(266)
As Reported Fair Value Contracts	782	112
Not Designated as Hedging Instrument \| Other Assets
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Asset Derivatives	0	0
Liability Derivatives	0	0
Less Counterparty Offsets	0	0
As Reported Fair Value Contracts	0	0
Not Designated as Hedging Instrument \| Current Liabilities
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Asset Derivatives	0	0
Liability Derivatives	434	330
Less Counterparty Offsets	(400)	(266)
As Reported Fair Value Contracts	34	64
Not Designated as Hedging Instrument \| Other Liabilities
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Asset Derivatives	0	0
Liability Derivatives	0	0
Less Counterparty Offsets	0	0
As Reported Fair Value Contracts	$ 0	$ 0

Fair value of liability associated with 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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226003-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Fair value, before 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. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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Fair value, after effects of master netting arrangements, of 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 offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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-Publisher FASB
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Fair value, after effects of master netting arrangements, of 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 offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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The number of derivative instruments of a particular group held by the entity.

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-Publisher FASB
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Current liabilities attributable to energy marketing activities (trading activities). Current energy marketing (trading activities) are when entities engage in both financial and physical trading to increase profits, manage their commodity price risk and enhance system reliability. They may trade electricity, coal, natural gas and oil. These entities typically use a variety of financial instruments, including forward contracts, options and swaps.

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Carrying amount as of the balance sheet date of the asset arising from energy trading activities that involves the purchase and sale of energy under forward contracts at fixed and variable prices and the buying and selling of financial energy contracts that include exchange futures and options and over the counter options and swaps, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.

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Amount of daily production of the applicable energy source.

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Total amount of product committed to be supplied under existing contracts or agreements.

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