Summary of Significant Accounting Policies, Use of Derivative Instruments (Details) $ in Thousands	12 Months Ended
Dec. 31, 2016 USD ($) BarrelsofOilPerDay Contract bbl	Mar. 31, 2017 USD ($) Contract bbl
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
As Reported Fair Value Contracts	$ 112	$ 468
As Reported Fair Value Contracts	$ 64	$ 0
April 2017 Through May 2017 [Member]
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Total volume committed under commodity purchase and sale contract (in barrels or mmbtu) \| bbl		145,000
January 2017 Through April 2017 [Member]
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Total volume committed under commodity purchase and sale contract (in barrels or mmbtu) \| bbl	145,000
Commodity Contract [Member]
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Number of contracts held \| Contract	2	4
Commodity Contract [Member] \| January 2017 Through March 2017 [Member]
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Volume committed per day under commodity purchase and sale contract (in barrels or mmbtu) \| BarrelsofOilPerDay	65
Commodity Contract [Member] \| Not Designated as Hedging Instrument [Member] \| Current Assets [Member]
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Asset Derivatives	$ 378	$ 750
Liability Derivatives	0	0
Less Counterparty Offsets	(266)	(282)
As Reported Fair Value Contracts	112	468
Commodity Contract [Member] \| Not Designated as Hedging Instrument [Member] \| Other Assets [Member]
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
Commodity Contract [Member] \| Not Designated as Hedging Instrument [Member] \| Current Liabilities [Member]
Fair Value Forward Hydrocarbon Commodity Contracts at Gross Valuation [Abstract]
Asset Derivatives	0	0
Liability Derivatives	330	282
Less Counterparty Offsets	(266)	(282)
As Reported Fair Value Contracts	64	0
Commodity Contract [Member] \| Not Designated as Hedging Instrument [Member] \| Other Liabilities [Member]
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
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The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were offset against collateral under a master netting arrangement.

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

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1207
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