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Summary Of Significant Accounting Policies (Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Reclassification Out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income tax expense | $ (13,051) | $ (16,710) | $ (46,395) | $ (47,055)
Total other comprehensive loss | 183 | 140 | 366 | (1,089)
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) | (598) | (622)
Amortization of net loss | 3,638 | 3,642 | 7,276 | 7,284
Adjustment due to effects of regulation | (3,057) | (3,115) | (6,115) | (8,338)
Total before tax | 282 | 216 | 563 | (1,676)
Income tax expense | (99) | (76) | (197) | 587
Total other comprehensive loss | $ 183 | 140 | $ 366 | $ (1,089)
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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