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Segment Information - Schedule (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Segment Reporting Information [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
Other operating expenses |  |  |  |  |  |  |  |  | 514,878 | 632,783 | 559,652
Depreciation and amortization |  |  |  |  |  |  |  |  | 275,612 | 267,808 | 241,188
Operating income | 18,588 | 147,805 | 71,150 | 47,738 | 60,552 | 140,540 | (93,615) | 36,723 | 285,281 | 144,200 | 236,047
Interest income |  |  |  |  |  |  |  |  | 14,223 | 14,022 | 15,540
Other income (deductions) |  |  |  |  |  |  |  |  | 22,840 | 29,643 | (15,286)
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 | 11,701 | $ 125,453 | $ 61,561 | $ (11,399) | 35,989 | $ 106,763 | $ (72,283) | $ 21,662 | 187,316 | 92,131 | 101,282
Valencia non-controlling interest |  |  |  |  |  |  |  |  | (14,013) | (14,241) | (15,112)
Subsidiary preferred stock dividends |  |  |  |  |  |  |  |  | (528) | (528) | (528)
Net Earnings Attributable to PNMR |  |  |  |  |  |  |  |  | 172,775 | 77,362 | 85,642
Total Assets | 7,939,854 |  |  |  | 7,298,774 |  |  |  | 7,939,854 | 7,298,774 | 6,865,551
Goodwill | 278,297 |  |  |  | 278,297 |  |  |  | $ 278,297 | 278,297 | 278,297
PNM |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 1 |  |
Other operating expenses |  |  |  |  |  |  |  |  | $ 414,445 | 554,661 | 481,030
Depreciation and amortization |  |  |  |  |  |  |  |  | 165,325 | 160,368 | 151,866
Operating income |  |  |  |  |  |  |  |  | 214,897 | 61,068 | 145,033
Interest income |  |  |  |  |  |  |  |  | 14,469 | 14,303 | 13,089
Other income (deductions) |  |  |  |  |  |  |  |  | 17,120 | 26,989 | (17,312)
Interest charges |  |  |  |  |  |  |  |  | (64,615) | (72,900) | (76,458)
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 181,871 | 29,460 | 64,352
Income taxes (benefit) |  |  |  |  |  |  |  |  | 21,857 | (25,962) | (5,971)
Net Earnings |  |  |  |  |  |  |  |  | 160,014 | 55,422 | 70,323
Valencia non-controlling interest |  |  |  |  |  |  |  |  | (14,013) | (14,241) | (15,112)
Subsidiary preferred stock dividends |  |  |  |  |  |  |  |  | (528) | (528) | (528)
Net Earnings Attributable to PNMR |  |  |  |  |  |  |  |  | 145,473 | 40,653 | 54,683
Total Assets | 5,581,033 |  |  |  | 5,242,991 |  |  |  | 5,581,033 | 5,242,991 | 5,035,883
Goodwill | 51,632 |  |  |  | 51,632 |  |  |  | $ 51,632 | 51,632 | 51,632
TNMP |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of operating segments | segment |  |  |  |  |  |  |  |  | 1 |  |
Other operating expenses |  |  |  |  |  |  |  |  | $ 104,852 | 98,621 | 96,272
Depreciation and amortization |  |  |  |  |  |  |  |  | 87,799 | 84,259 | 66,189
Operating income |  |  |  |  |  |  |  |  | 88,453 | 85,814 | 96,497
Interest income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other income (deductions) |  |  |  |  |  |  |  |  | 6,828 | 4,131 | 4,065
Interest charges |  |  |  |  |  |  |  |  | (30,388) | (29,100) | (32,091)
Earnings before Income Taxes |  |  |  |  |  |  |  |  | 64,893 | 60,845 | 68,471
Income taxes (benefit) |  |  |  |  |  |  |  |  | 6,308 | 5,046 | 16,880
Net Earnings |  |  |  |  |  |  |  |  | 58,585 | 55,799 | 51,591
Valencia non-controlling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Subsidiary preferred stock dividends |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Earnings Attributable to PNMR |  |  |  |  |  |  |  |  | 58,585 | 55,799 | 51,591
Total Assets | 2,132,580 |  |  |  | 1,860,439 |  |  |  | 2,132,580 | 1,860,439 | 1,665,177
Goodwill | 226,665 |  |  |  | 226,665 |  |  |  | 226,665 | 226,665 | 226,665
Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operating expenses |  |  |  |  |  |  |  |  | (4,419) | (20,499) | (17,650)
Depreciation and amortization |  |  |  |  |  |  |  |  | 22,488 | 23,181 | 23,133
Operating income |  |  |  |  |  |  |  |  | (18,069) | (2,682) | (5,483)
Interest income |  |  |  |  |  |  |  |  | (246) | (281) | 2,451
Other income (deductions) |  |  |  |  |  |  |  |  | (1,108) | (1,477) | (2,039)
Interest charges |  |  |  |  |  |  |  |  | (19,389) | (19,016) | (18,695)
Earnings before Income Taxes |  |  |  |  |  |  |  |  | (38,812) | (23,456) | (23,766)
Income taxes (benefit) |  |  |  |  |  |  |  |  | (7,529) | (4,366) | (3,134)
Net Earnings |  |  |  |  |  |  |  |  | (31,283) | (19,090) | (20,632)
Valencia non-controlling interest |  |  |  |  |  |  |  |  | 0 | 0 | 0
Subsidiary preferred stock dividends |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net Earnings Attributable to PNMR |  |  |  |  |  |  |  |  | (31,283) | (19,090) | (20,632)
Total Assets | 226,241 |  |  |  | 195,344 |  |  |  | 226,241 | 195,344 | 164,491
Goodwill | $ 0 |  |  |  | $ 0 |  |  |  | 0 | 0 | 0
Electricity |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 1,523,012 | 1,457,603 | 1,436,613
Cost of energy |  |  |  |  |  |  |  |  | 447,241 | 412,812 | 399,726
Utility margin |  |  |  |  |  |  |  |  | 1,075,771 | 1,044,791 | 1,036,887
Electricity | PNM |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 1,139,834 | 1,093,822 | 1,091,965
Cost of energy |  |  |  |  |  |  |  |  | 345,167 | 317,725 | 314,036
Utility margin |  |  |  |  |  |  |  |  | 794,667 | 776,097 | 777,929
Electricity | TNMP |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 383,178 | 363,781 | 344,648
Cost of energy |  |  |  |  |  |  |  |  | 102,074 | 95,087 | 85,690
Utility margin |  |  |  |  |  |  |  |  | 281,104 | 268,694 | 258,958
Electricity | Corporate and Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of energy |  |  |  |  |  |  |  |  | 0 | 0 | 0
Utility margin |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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