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Schedule I - Condensed Financial Information of Parent Company - Statements of Earnings (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 359,276 | $ 472,465 | $ 357,649 | $ 333,622 | $ 344,144 | $ 433,586 | $ 330,228 | $ 349,645 | $ 1,523,012 | $ 1,457,603 | $ 1,436,613
Operating Expenses |  |  |  |  |  |  |  |  | 1,237,731 | 1,313,403 | 1,200,566
Operating income | 18,588 | 147,805 | 71,150 | 47,738 | 60,552 | 140,540 | (93,615) | 36,723 | 285,281 | 144,200 | 236,047
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | 19,973 | 15,382 | 17,586
Net other income and (deductions) |  |  |  |  |  |  |  |  | 37,063 | 43,665 | 254
Interest Charges |  |  |  |  |  |  |  |  | 114,392 | 121,016 | 127,244
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 207,952 | 66,849 | 109,057
Income taxes (benefit) |  |  |  |  |  |  |  |  | 20,636 | (25,282) | 7,775
Net earnings | $ 8,778 | $ 121,768 | $ 57,489 | $ (15,260) | $ 31,805 | $ 102,771 | $ (75,914) | $ 18,700 |  |  |
PNM Resources |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Expenses |  |  |  |  |  |  |  |  | 28,299 | 3,983 | 7,475
Operating income |  |  |  |  |  |  |  |  | (28,299) | (3,983) | (7,475)
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 211,291 | 96,324 | 109,995
Other income |  |  |  |  |  |  |  |  | (269) | 731 | 2,048
Net other income and (deductions) |  |  |  |  |  |  |  |  | 211,022 | 97,055 | 112,043
Interest Charges |  |  |  |  |  |  |  |  | 19,078 | 19,581 | 19,453
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 163,645 | 73,491 | 85,115
Income taxes (benefit) |  |  |  |  |  |  |  |  | (9,130) | (3,872) | (527)
Net earnings |  |  |  |  |  |  |  |  | $ 172,775 | $ 77,363 | $ 85,642

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