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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | $ (9,825) | $ (17,957) | $ (16,409) | $ (19,334)
Included in regulatory assets/liabilities | 912 | (2,253) | 1,067 | (5,601)
Settlements | 0 | (43) | 6,429 | 4,682
Ending Balance | (8,913) | (20,253) | (8,913) | (20,253)
Natural Gas Exchange Agreements [Member] |  |  |  |
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | (3,480) | (4,173) | (3,164) | (5,885)
Included in regulatory assets/liabilities | 476 | 617 | (89) | 2,434
Settlements | 0 | (43) | 249 | (148)
Ending Balance | (3,004) | (3,599) | (3,004) | (3,599)
Power Exchange Agreements [Member] |  |  |  |
Fair Value Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Beginning Balance | (6,345) | (13,784) | (13,245) | (13,449)
Included in regulatory assets/liabilities | 436 | (2,870) | 1,156 | (8,035)
Settlements | 0 | 0 | 6,180 | 4,830
Ending Balance | $ (5,909) | $ (16,654) | $ (5,909) | $ (16,654)

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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