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Management's Statement: Reclassification (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Fuel, purchased power and cost of natural gas sold | $ 71,686 | $ 73,544 | $ 331,194 | $ 413,486
Operations and maintenance | 122,759 | 116,583 | 365,533 | 365,116
Operating income | $ 82,234 | 70,551 | $ 302,352 | 284,683
Scenario, Adjustment |  |  |  |
Fuel, purchased power and cost of natural gas sold |  | 500 |  | 1,800
Operations and maintenance |  | (500) |  | (1,800)
Operating income |  | $ 0 |  | $ 0

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