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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) - Level 3 [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | $ (2,716) | $ (12,968) | $ (5,262) | $ (16,409)
Included in regulatory assets/liabilities | 625 | 1,829 | 8,584 | 155
Settlements | (901) | 1,314 | (6,314) | 6,429
Ending Balance | (2,992) | (9,825) | (2,992) | (9,825)
Natural Gas Exchange Agreements [Member] |  |  |  |
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | (2,104) | (2,805) | (2,774) | (3,164)
Included in regulatory assets/liabilities | (829) | (768) | 8,148 | (565)
Settlements | (59) | 93 | (8,366) | 249
Ending Balance | (2,992) | (3,480) | (2,992) | (3,480)
Power Exchange Agreements [Member] |  |  |  |
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | (612) | (10,163) | (2,488) | (13,245)
Included in regulatory assets/liabilities | 1,454 | 2,597 | 436 | 720
Settlements | (842) | 1,221 | 2,052 | 6,180
Ending Balance | $ 0 | $ (6,345) | $ 0 | $ (6,345)

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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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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=99377789&loc=d3e19207-110258 + Details
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- Definition Fair value 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) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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