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Accounting for Derivative Instruments - Offsetting Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Commodity Contract |  |
Offsetting Assets [Line Items] |  |
Gross Assets | $ 28,145 | $ 1,000
Gross Amounts Offset | (16,718) | (395)
Net Assets | 11,427 | 605
Cash Collateral Offset | 0 | 0
Net Amount Presented | 11,427 | 605
Commodity Contract, Current |  |
Offsetting Assets [Line Items] |  |
Gross Assets | 20,271 | 1,000
Gross Amounts Offset | (11,927) | (395)
Net Assets | 8,344 | 605
Cash Collateral Offset | 0 | 0
Net Amount Presented | 8,344 | 605
Non-trading Commodity Contract, Current |  |
Offsetting Assets [Line Items] |  |
Gross Assets | 19,657 | 589
Gross Amounts Offset | (11,844) | (389)
Net Assets | 7,813 | 200
Cash Collateral Offset | 0 | 0
Net Amount Presented | 7,813 | 200
Trading Commodity Contract, Current |  |
Offsetting Assets [Line Items] |  |
Gross Assets | 614 | 411
Gross Amounts Offset | (83) | (6)
Net Assets | 531 | 405
Cash Collateral Offset | 0 | 0
Net Amount Presented | 531 | 405
Commodity Contract, Noncurrent |  |
Offsetting Assets [Line Items] |  |
Gross Assets | 7,874 | 0
Gross Amounts Offset | (4,791) | 0
Net Assets | 3,083 | 0
Cash Collateral Offset | 0 | 0
Net Amount Presented | 3,083 | 0
Non-trading Commodity Contract, Noncurrent |  |
Offsetting Assets [Line Items] |  |
Gross Assets | 7,874 | 0
Gross Amounts Offset | (4,791) | 0
Net Assets | 3,083 | 0
Cash Collateral Offset | 0 | 0
Net Amount Presented | $ 3,083 | $ 0

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- Definition 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. + References 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 -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -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 + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + 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 (b) -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 (d)(2) -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 13 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226016-175313 + Details
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- Definition 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. + References Reference 1: 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 2: 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 3: 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 Reference 4: 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 + Details
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