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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Expenses |  |  |  |  |  |  |  |  | $ 1,138,518 | $ 1,084,966 | $ 1,314,732
Operating income | $ 22,936 | $ 142,484 | $ 85,105 | $ 55,960 | $ 63,584 | $ 108,071 | $ 64,822 | $ 41,508 | 306,485 | 277,985 | 124,350
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  | 19,515 | 17,796 | 26,833
Net other income and deductions |  |  |  |  |  |  |  |  | 46,899 | 45,822 | 36,663
Interest Charges |  |  |  |  |  |  |  |  | 127,625 | 128,633 | 114,860
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 225,759 | 195,174 | 46,153
Income Taxes |  |  |  |  |  |  |  |  | 130,340 | 63,278 | 15,075
Net Earnings Attributable to Company | $ (54,282) | $ 73,739 | $ 37,555 | $ 22,862 | $ 24,809 | $ 54,418 | $ 27,076 | $ 10,546 | 79,874 | 116,849 | 15,640
PNM Resources |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Operating Expenses |  |  |  |  |  |  |  |  | 2,902 | 2,871 | 1,221
Operating income |  |  |  |  |  |  |  |  | (2,902) | (2,871) | (1,221)
Other Income and Deductions: |  |  |  |  |  |  |  |  |  |  |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 111,877 | 122,252 | 27,352
Other income |  |  |  |  |  |  |  |  | 1,181 | 1,711 | 747
Net other income and deductions |  |  |  |  |  |  |  |  | 113,058 | 123,963 | 28,099
Interest Charges |  |  |  |  |  |  |  |  | 12,490 | 8,102 | 8,275
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 97,666 | 112,990 | 18,603
Income Taxes |  |  |  |  |  |  |  |  | 17,792 | (3,859) | 2,963
Net Earnings Attributable to Company |  |  |  |  |  |  |  |  | $ 79,874 | $ 116,849 | $ 15,640

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