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Accounting for Derivative Instruments - Offsetting Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Commodity Contract |  |
Offsetting Liabilities [Line Items] |  |
Gross Liabilities | $ (18,880) | $ (1,059)
Gross Amounts Offset | 11,893 | 311
Net Liabilities | (6,987) | (748)
Cash Collateral Offset | 300 | 0
Net Amount Presented | (6,687) | (748)
Commodity Contract, Current |  |
Offsetting Liabilities [Line Items] |  |
Gross Liabilities | (11,035) | (754)
Gross Amounts Offset | 9,012 | 74
Net Liabilities | (2,023) | (680)
Cash Collateral Offset | 300 | 0
Net Amount Presented | (1,723) | (680)
Trading Commodity Contract, Current |  |
Offsetting Liabilities [Line Items] |  |
Gross Liabilities | (20) | (92)
Gross Amounts Offset | 0 | 5
Net Liabilities | (20) | (87)
Cash Collateral Offset | 0 | 0
Net Amount Presented | (20) | (87)
Not Designated as Hedging Instrument | Non-trading Commodity Contract, Current |  |
Offsetting Liabilities [Line Items] |  |
Gross Liabilities | (11,015) | (662)
Gross Amounts Offset | 9,012 | 69
Net Liabilities | (2,003) | (593)
Cash Collateral Offset | 300 | 0
Net Amount Presented | (1,703) | (593)
Not Designated as Hedging Instrument | Trading Commodity Contract, Current |  |
Offsetting Liabilities [Line Items] |  |
Gross Liabilities | (240) |
Gross Amounts Offset | 116 |
Net Liabilities | (124) |
Cash Collateral Offset | 0 |
Net Amount Presented | (124) |
Not Designated as Hedging Instrument | Commodity Contract, Noncurrent |  |
Offsetting Liabilities [Line Items] |  |
Gross Liabilities | (7,845) | (305)
Gross Amounts Offset | 2,881 | 237
Net Liabilities | (4,964) | (68)
Cash Collateral Offset | 0 | 0
Net Amount Presented | (4,964) | (68)
Not Designated as Hedging Instrument | Non-trading Commodity Contract, Noncurrent |  |
Offsetting Liabilities [Line Items] |  |
Gross Liabilities | (7,605) | (305)
Gross Amounts Offset | 2,765 | 237
Net Liabilities | (4,840) | (68)
Cash Collateral Offset | 0 | 0
Net Amount Presented | $ (4,840) | $ (68)

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- Definition Fair value, before 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 + Details
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- Definition Fair value, after offset of derivative asset, 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, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226006-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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