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Derivative Accounting - Gains and Losses from Derivative Instruments (Details) - Commodity Contracts - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Designated as Hedging Instruments |  |  |
Derivative Instruments in Designated Cash Flows Hedges |  |  |
Gain (Loss) Recognized in OCI on Derivative Instruments (Effective Portion) | $ 47,000 | $ (615,000) | $ (372,000)
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion Realized) | (3,926,000) | (5,988,000) | (21,415,000)
Amount reclassified from accumulated other comprehensive income to earnings related to discontinued cash flow hedges | 0 | 0 | 0
Not Designated as Hedging Instruments |  |  |
Derivative Instruments Not Designated as Cash Flows Hedges |  |  |
Net Gain (Loss) Recognized in Income | 26,482,000 | (108,399,000) | (66,043,000)
Revenue | Not Designated as Hedging Instruments |  |  |
Derivative Instruments Not Designated as Cash Flows Hedges |  |  |
Net Gain (Loss) Recognized in Income | 771,000 | 574,000 | 324,000
Fuel and purchased power | Not Designated as Hedging Instruments |  |  |
Derivative Instruments Not Designated as Cash Flows Hedges |  |  |
Net Gain (Loss) Recognized in Income | $ 25,711,000 | $ (108,973,000) | $ (66,367,000)

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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