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Fair Value (Reconciliation For All Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Details) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | $ (2,976) | $ (5,262) | $ (16,409) | $ (19,334)
Included in regulatory assets/liabilities | 8,610 | 5,353 | (4,382) |
Settlements | (6,324) | 5,794 | 7,307 |
Transfers, Net | 0 | 0 | 0 |
Gain (Loss) Included in Earnings | 0 | 0 | 0 |
Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 | 0 | 0 |
Purchases | 0 | 0 | 0 |
Issuances | 0 | 0 | 0 |
Natural Gas Exchange Agreements [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | (2,976) | (2,774) | (3,164) | (5,885)
Included in regulatory assets/liabilities | 8,175 | 326 | 3,292 |
Settlements | (8,377) | 64 | (571) |
Transfers, Net | 0 | 0 | 0 |
Gain (Loss) Included in Earnings | 0 | 0 | 0 |
Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 | 0 | 0 |
Purchases | 0 | 0 | 0 |
Issuances | 0 | 0 | 0 |
Power Exchange Agreements [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Beginning balance | 0 | (2,488) | (13,245) | $ (13,449)
Included in regulatory assets/liabilities | 435 | 5,027 | (7,674) |
Settlements | 2,053 | 5,730 | 7,878 |
Transfers, Net | 0 | 0 | 0 |
Gain (Loss) Included in Earnings | 0 | 0 | 0 |
Gain (Loss) Included in Other Comprehensive Income (Loss) | 0 | 0 | 0 |
Purchases | 0 | 0 | 0 |
Issuances | $ 0 | $ 0 | $ 0 |

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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Realized And Unrealized Gains Losses Included In Regulatory Assets + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as a liability into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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