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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Designated as Hedging Instruments |  |  |
Derivative Instruments in Designated Cash Flows Hedges |  |  |
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 | (15,508,000) | (89,183,000) | 26,482,000
Revenue | Not Designated as Hedging Instruments |  |  |
Derivative Instruments Not Designated as Cash Flows Hedges |  |  |
Net Gain (Loss) Recognized in Income | (2,557,000) | (1,192,000) | 771,000
Fuel and purchased power | Designated as Hedging Instruments |  |  |
Derivative Instruments in Designated Cash Flows Hedges |  |  |
Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion Realized) | (2,000,000) | (3,519,000) | (3,926,000)
Fuel and purchased power | Not Designated as Hedging Instruments |  |  |
Derivative Instruments Not Designated as Cash Flows Hedges |  |  |
Net Gain (Loss) Recognized in Income | (12,951,000) | (87,991,000) | 25,711,000
Other Comprehensive Income (Loss) | Designated as Hedging Instruments |  |  |
Derivative Instruments in Designated Cash Flows Hedges |  |  |
Gain (Loss) Recognized in OCI on Derivative Instruments (Effective Portion) | $ 0 | $ (59,000) | $ 47,000

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109978405&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 + Details
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