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Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Electric operating revenues | $ 362,320 | $ 315,391 | $ 692,498 | $ 626,352 |
Cost of energy | 104,267 | 81,363 | 207,070 | 173,732 |
Utility margin | 258,053 | 234,028 | 485,428 | 452,620 |
Other operating expenses | 115,323 | 118,251 | 230,355 | 245,507 |
Depreciation and amortization | 57,625 | 50,955 | 114,008 | 100,784 |
Operating income | 85,105 | 64,822 | 141,065 | 106,329 |
Interest income | 3,885 | 10,194 | 8,766 | 13,815 |
Other income (deductions) | 6,209 | 4,791 | 14,288 | 12,275 |
Interest charges | (32,332) | (33,221) | (64,031) | (64,712) |
Earnings before Income Taxes | 62,867 | 46,586 | 100,088 | 67,707 |
Income taxes (benefit) | 21,636 | 15,634 | 32,411 | 22,790 |
Net Earnings | 41,231 | 30,952 | 67,677 | 44,917 |
Valencia non-controlling interest | (3,544) | (3,744) | (6,996) | (7,031) |
Subsidiary preferred stock dividends | (132) | (132) | (264) | (264) |
Net Earnings Available for PNM Common Stock | 37,555 | 27,076 | 60,417 | 37,622 |
Total Assets | 6,584,445 | 6,360,456 | 6,584,445 | 6,360,456 | $ 6,471,080
Goodwill | 278,297 | 278,297 | 278,297 | 278,297 | $ 278,297
PNM |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Electric operating revenues | 276,097 | 233,346 | 527,655 | 468,952 |
Cost of energy | 82,952 | 61,367 | 164,268 | 133,811 |
Utility margin | 193,145 | 171,979 | 363,387 | 335,141 |
Other operating expenses | 97,533 | 97,617 | 193,427 | 205,619 |
Depreciation and amortization | 36,448 | 32,602 | 72,464 | 64,466 |
Operating income | 59,164 | 41,760 | 97,496 | 65,056 |
Interest income | 1,858 | 5,518 | 4,675 | 7,040 |
Other income (deductions) | 5,900 | 4,382 | 13,582 | 12,325 |
Interest charges | (20,931) | (22,690) | (41,943) | (44,281) |
Earnings before Income Taxes | 45,991 | 28,970 | 73,810 | 40,140 |
Income taxes (benefit) | 15,515 | 9,177 | 23,223 | 12,788 |
Net Earnings | 30,476 | 19,793 | 50,587 | 27,352 |
Valencia non-controlling interest | (3,544) | (3,744) | (6,996) | (7,031) |
Subsidiary preferred stock dividends | (132) | (132) | (264) | (264) |
Net Earnings Available for PNM Common Stock | 26,800 | 15,917 | 43,327 | 20,057 |
Total Assets | 4,939,407 | 4,775,481 | 4,939,407 | 4,775,481 |
Goodwill | 51,632 | 51,632 | 51,632 | 51,632 |
TNMP |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Electric operating revenues | 86,223 | 82,045 | 164,843 | 157,400 |
Cost of energy | 21,315 | 19,996 | 42,802 | 39,921 |
Utility margin | 64,908 | 62,049 | 122,041 | 117,479 |
Other operating expenses | 23,025 | 23,777 | 46,822 | 46,144 |
Depreciation and amortization | 15,597 | 14,897 | 30,968 | 29,406 |
Operating income | 26,286 | 23,375 | 44,251 | 41,929 |
Interest income | 0 | 0 | 0 | 0 |
Other income (deductions) | 432 | 677 | 1,165 | 1,285 |
Interest charges | (7,510) | (7,473) | (14,915) | (14,841) |
Earnings before Income Taxes | 19,208 | 16,579 | 30,501 | 28,373 |
Income taxes (benefit) | 7,004 | 6,071 | 10,693 | 10,408 |
Net Earnings | 12,204 | 10,508 | 19,808 | 17,965 |
Valencia non-controlling interest | 0 | 0 | 0 | 0 |
Subsidiary preferred stock dividends | 0 | 0 | 0 | 0 |
Net Earnings Available for PNM Common Stock | 12,204 | 10,508 | 19,808 | 17,965 |
Total Assets | 1,437,547 | 1,339,525 | 1,437,547 | 1,339,525 |
Goodwill | 226,665 | 226,665 | 226,665 | 226,665 |
Corporate and Other |  |  |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |  |  |
Electric operating revenues | 0 | 0 | 0 | 0 |
Cost of energy | 0 | 0 | 0 | 0 |
Utility margin | 0 | 0 | 0 | 0 |
Other operating expenses | (5,235) | (3,143) | (9,894) | (6,256) |
Depreciation and amortization | 5,580 | 3,456 | 10,576 | 6,912 |
Operating income | (345) | (313) | (682) | (656) |
Interest income | 2,027 | 4,676 | 4,091 | 6,775 |
Other income (deductions) | (123) | (268) | (459) | (1,335) |
Interest charges | (3,891) | (3,058) | (7,173) | (5,590) |
Earnings before Income Taxes | (2,332) | 1,037 | (4,223) | (806) |
Income taxes (benefit) | (883) | 386 | (1,505) | (406) |
Net Earnings | (1,449) | 651 | (2,718) | (400) |
Valencia non-controlling interest | 0 | 0 | 0 | 0 |
Subsidiary preferred stock dividends | 0 | 0 | 0 | 0 |
Net Earnings Available for PNM Common Stock | (1,449) | 651 | (2,718) | (400) |
Total Assets | 207,491 | 245,450 | 207,491 | 245,450 |
Goodwill | $ 0 | $ 0 | $ 0 | $ 0 |

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