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v3.20.2

Other Comprehensive Income (Loss): Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Interest Expense | $ 36,521 |  |  | $ 34,000 |  |  | $ 108,067 | $ 103,677
Fuel, purchased power and cost of natural gas sold | 71,686 |  |  | 73,544 |  |  | 331,194 | 413,486
Income before Income Taxes | 45,000 |  |  | 17,903 |  |  | 187,751 | 162,528
Income tax benefit (expense) | (4,651) |  |  | (2,508) |  |  | (25,484) | (22,078)
Net income (loss) | 40,349 | $ 24,694 | $ 97,224 | 15,395 | $ 17,693 | $ 107,362 | 162,267 | 140,450
Operations and maintenance | 122,759 |  |  | 116,583 |  |  | 365,533 | 365,116
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Net income (loss) | (1,111) |  |  | (647) |  |  | (3,497) | (1,555)
Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Income before Income Taxes | (890) |  |  | (842) |  |  | (2,872) | (1,631)
Income tax benefit (expense) | 209 |  |  | 170 |  |  | 680 | 358
Net income (loss) | (681) |  |  | (672) |  |  | (2,192) | (1,273)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Operations and maintenance | 24 |  |  | 19 |  |  | 79 | 58
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Operations and maintenance | (597) |  |  | (83) |  |  | (1,791) | (524)
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Income before Income Taxes | (573) |  |  | (64) |  |  | (1,712) | (466)
Income tax benefit (expense) | 143 |  |  | 89 |  |  | 407 | 184
Net income (loss) | (430) |  |  | 25 |  |  | (1,305) | (282)
Interest rate swaps | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Interest Expense | (712) |  |  | (713) |  |  | (2,138) | (2,139)
Commodity Contracts | Cash Flow Hedging | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |
Fuel, purchased power and cost of natural gas sold | $ (178) |  |  | $ (129) |  |  | $ (734) | $ 508

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