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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues | $ 344,144 | $ 433,586 | $ 330,228 | $ 349,645 | $ 343,756 | $ 422,666 | $ 352,313 | $ 317,878 | $ 1,457,603 | $ 1,436,613 | $ 1,445,003
Operating Expenses |  |  |  |  |  |  |  |  | 1,313,403 | 1,200,566 | 1,129,964
Operating income | 60,552 | 140,540 | (93,615) | 36,723 | (17,404) | 127,990 | 79,329 | 46,132 | 144,200 | 236,047 | 315,039
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | 15,382 | 17,586 | 19,515
Net other income and deductions |  |  |  |  |  |  |  |  | 43,665 | 254 | 38,345
Interest charges |  |  |  |  |  |  |  |  | 121,016 | 127,244 | 127,625
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 66,849 | 109,057 | 225,759
Income taxes (benefit) |  |  |  |  |  |  |  |  | (25,282) | 7,775 | 130,340
Net Earnings Attributable to Company | $ 31,805 | $ 102,771 | $ (75,914) | $ 18,700 | $ (55,077) | $ 87,521 | $ 38,208 | $ 14,990 |  |  |
PNM Resources |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Expenses |  |  |  |  |  |  |  |  | 3,983 | 7,475 | 2,902
Operating income |  |  |  |  |  |  |  |  | (3,983) | (7,475) | (2,902)
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 96,324 | 109,995 | 111,877
Other income |  |  |  |  |  |  |  |  | 731 | 2,048 | 1,181
Net other income and deductions |  |  |  |  |  |  |  |  | 97,055 | 112,043 | 113,058
Interest charges |  |  |  |  |  |  |  |  | 19,581 | 19,453 | 12,490
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 73,491 | 85,115 | 97,666
Income taxes (benefit) |  |  |  |  |  |  |  |  | (3,872) | (527) | 17,792
Net Earnings Attributable to Company |  |  |  |  |  |  |  |  | $ 77,363 | $ 85,642 | $ 79,874

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