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Segment Information - Summarized Financial Information (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Electric operating revenues | $ 330,178 | $ 310,961 |
Cost of energy | 102,804 | 92,369 |
Utility margin | 227,374 | 218,592 |
Other operating expenses | 115,031 | 127,255 |
Depreciation and amortization | 56,383 | 49,829 |
Operating income | 55,960 | 41,508 |
Interest income | 4,881 | 3,622 |
Other income (deductions) | 8,080 | 7,483 |
Interest charges | (31,700) | (31,491) |
Earnings before Income Taxes | 37,221 | 21,122 |
Income taxes (benefit) | 10,775 | 7,157 |
Net Earnings | 26,446 | 13,965 |
Valencia non-controlling interest | (3,452) | (3,287) |
Subsidiary preferred stock dividends | (132) | (132) |
Net Earnings Available for PNM Common Stock | 22,862 | 10,546 |
Total Assets | 6,477,679 | 6,273,812 | $ 6,471,080
Goodwill | 278,297 | 278,297 | $ 278,297
PNM |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Electric operating revenues | 251,558 | 235,606 |
Cost of energy | 81,317 | 72,444 |
Utility margin | 170,241 | 163,162 |
Other operating expenses | 95,894 | 108,001 |
Depreciation and amortization | 36,016 | 31,864 |
Operating income | 38,331 | 23,297 |
Interest income | 2,816 | 1,522 |
Other income (deductions) | 7,683 | 7,943 |
Interest charges | (21,012) | (21,591) |
Earnings before Income Taxes | 27,818 | 11,171 |
Income taxes (benefit) | 7,708 | 3,610 |
Net Earnings | 20,110 | 7,561 |
Valencia non-controlling interest | (3,452) | (3,287) |
Subsidiary preferred stock dividends | (132) | (132) |
Net Earnings Available for PNM Common Stock | 16,526 | 4,142 |
Total Assets | 4,870,201 | 4,719,346 |
Goodwill | 51,632 | 51,632 |
TNMP |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Electric operating revenues | 78,620 | 75,355 |
Cost of energy | 21,487 | 19,925 |
Utility margin | 57,133 | 55,430 |
Other operating expenses | 23,797 | 22,368 |
Depreciation and amortization | 15,371 | 14,508 |
Operating income | 17,965 | 18,554 |
Interest income | 0 | 0 |
Other income (deductions) | 732 | 608 |
Interest charges | (7,404) | (7,369) |
Earnings before Income Taxes | 11,293 | 11,793 |
Income taxes (benefit) | 3,689 | 4,337 |
Net Earnings | 7,604 | 7,456 |
Valencia non-controlling interest | 0 | 0 |
Subsidiary preferred stock dividends | 0 | 0 |
Net Earnings Available for PNM Common Stock | 7,604 | 7,456 |
Total Assets | 1,396,055 | 1,312,402 |
Goodwill | 226,665 | 226,665 |
Corporate and Other |  |  |
Segment Reporting Information, Profit (Loss) [Abstract] |  |  |
Electric operating revenues | 0 | 0 |
Cost of energy | 0 | 0 |
Utility margin | 0 | 0 |
Other operating expenses | (4,660) | (3,114) |
Depreciation and amortization | 4,996 | 3,457 |
Operating income | (336) | (343) |
Interest income | 2,065 | 2,100 |
Other income (deductions) | (335) | (1,068) |
Interest charges | (3,284) | (2,531) |
Earnings before Income Taxes | (1,890) | (1,842) |
Income taxes (benefit) | (622) | (790) |
Net Earnings | (1,268) | (1,052) |
Valencia non-controlling interest | 0 | 0 |
Subsidiary preferred stock dividends | 0 | 0 |
Net Earnings Available for PNM Common Stock | (1,268) | (1,052) |
Total Assets | 211,423 | 242,064 |
Goodwill | $ 0 | $ 0 |

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