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Summary Of Significant Accounting Policies (Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Income tax expense | $ (33,344) | $ (30,345)
Total other comprehensive loss | 183 | (1,229)
Reclassification Out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Amortization of net prior service cost | (299) | (311)
Amortization of net loss | 3,638 | 3,642
Adjustment due to effects of regulation | (3,058) | (5,223)
Total before tax | 281 | (1,892)
Income tax expense | (98) | 663
Total other comprehensive loss | $ 183 | (1,229)
OREGON | Reclassification Out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |
Adjustment due to effects of regulation |  | $ (2,100)

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