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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | $ 1,436,613 | $ 1,445,003 | $ 1,362,951
Operating Expenses |  |  |  |  |  |  |  |  | 1,200,566 | 1,129,964 | 1,078,226
Operating income | $ (17,404) | $ 127,990 | $ 79,329 | $ 46,132 | $ 22,936 | $ 142,484 | $ 85,105 | $ 55,960 | 236,047 | 315,039 | 284,725
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | 17,586 | 19,515 | 17,796
Net other income and deductions |  |  |  |  |  |  |  |  | 254 | 38,345 | 39,082
Interest charges |  |  |  |  |  |  |  |  | 127,244 | 127,625 | 128,633
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 109,057 | 225,759 | 195,174
Income Taxes |  |  |  |  |  |  |  |  | 7,775 | 130,340 | 63,278
Net Earnings Attributable to Company | $ (55,077) | $ 87,521 | $ 38,208 | $ 14,990 | $ (54,282) | $ 73,739 | $ 37,555 | $ 22,862 |  |  |
PNM Resources |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Expenses |  |  |  |  |  |  |  |  | 7,475 | 2,902 | 2,871
Operating income |  |  |  |  |  |  |  |  | (7,475) | (2,902) | (2,871)
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 109,995 | 111,877 | 122,252
Other income |  |  |  |  |  |  |  |  | 2,048 | 1,181 | 1,711
Net other income and deductions |  |  |  |  |  |  |  |  | 112,043 | 113,058 | 123,963
Interest charges |  |  |  |  |  |  |  |  | 19,453 | 12,490 | 8,102
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 85,115 | 97,666 | 112,990
Income Taxes |  |  |  |  |  |  |  |  | (527) | 17,792 | (3,859)
Net Earnings Attributable to Company |  |  |  |  |  |  |  |  | $ 85,642 | $ 79,874 | $ 116,849

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