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Fair Value (Carrying Value And Estimated Fair Value Of Financial Instruments) (Details) $ in Thousands | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($)
--- | --- | ---
Fair Value and Carrying Value, by Balance Sheet Grouping [Line Items] |  |
Finance Lease, Liability | $ 54,550 |
Capital Lease Obligations | 0 | $ 57,210
Estimated Fair Value [Member] | Level 2 [Member] |  |
Fair Value and Carrying Value, by Balance Sheet Grouping [Line Items] |  |
Long-term debt | 1,124,649 | 1,142,292
Estimated Fair Value [Member] | Level 3 [Member] |  |
Fair Value and Carrying Value, by Balance Sheet Grouping [Line Items] |  |
Long-term debt | 1,048,440 | 734,742
Estimated Fair Value [Member] | Level 3 [Member] | Affiliated Entity [Member] |  |
Fair Value and Carrying Value, by Balance Sheet Grouping [Line Items] |  |
Long-term debt | 41,238 | 38,145
Carrying Value [Member] | Level 2 [Member] |  |
Fair Value and Carrying Value, by Balance Sheet Grouping [Line Items] |  |
Long-term debt | 963,500 | 1,053,500
Carrying Value [Member] | Level 3 [Member] |  |
Fair Value and Carrying Value, by Balance Sheet Grouping [Line Items] |  |
Long-term debt | 947,000 | 767,000
Carrying Value [Member] | Level 3 [Member] | Affiliated Entity [Member] |  |
Fair Value and Carrying Value, by Balance Sheet Grouping [Line Items] |  |
Long-term debt | 51,547 | 51,547
Alaska Electric Light & Power [Member] | Estimated Fair Value [Member] | Level 3 [Member] |  |
Fair Value and Carrying Value, by Balance Sheet Grouping [Line Items] |  |
Finance Lease, Liability | 58,000 |
Capital Lease Obligations |  | 55,600
Alaska Electric Light & Power [Member] | Carrying Value [Member] | Level 3 [Member] |  |
Fair Value and Carrying Value, by Balance Sheet Grouping [Line Items] |  |
Finance Lease, Liability | $ 54,550 |
Capital Lease Obligations |  | $ 57,210
Measurement Input, Quoted Price [Member] | Estimated Fair Value [Member] | Secured and Unsecured Debt [Member] |  |
Fair Value and Carrying Value, by Balance Sheet Grouping [Line Items] |  |
Fair Value Measurement Inputs, Offered Quotes | $ / shares | 100.00 |
Measurement Input, Quoted Price [Member] | Minimum [Member] | Estimated Fair Value [Member] | Secured and Unsecured Debt [Member] |  |
Fair Value and Carrying Value, by Balance Sheet Grouping [Line Items] |  |
Fair Value Measurement Inputs, Offered Quotes | $ / shares | 80.00 |
Measurement Input, Quoted Price [Member] | Maximum [Member] | Estimated Fair Value [Member] | Secured and Unsecured Debt [Member] |  |
Fair Value and Carrying Value, by Balance Sheet Grouping [Line Items] |  |
Fair Value Measurement Inputs, Offered Quotes | $ / shares | 134.11 |

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- Definition Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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