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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2016
Segment Reporting [Abstract] |
Summary of Segments | PNMR SEGMENT INFORMATION
2016 | PNM |  | TNMP |  | Corporate and Other |  | Consolidated
| (In thousands)
Electric operating revenues | $ | 1,035,913 |  |  | $ | 327,038 |  |  | $ | — |  |  | $ | 1,362,951 |
Cost of energy | 299,714 |  |  | 80,882 |  |  | — |  |  | 380,596 |
Utility margin | 736,199 |  |  | 246,156 |  |  | — |  |  | 982,355 |
Other operating expenses | 414,662 |  |  | 93,389 |  |  | (12,791 | ) |  | 495,260 |
Depreciation and amortization | 133,447 |  |  | 61,126 |  |  | 14,537 |  |  | 209,110 |
Operating income (loss) | 188,090 |  |  | 91,641 |  |  | (1,746 | ) |  | 277,985 |
Interest income | 10,173 |  |  | — |  |  | 12,120 |  |  | 22,293 |
Other income (deductions) | 22,066 |  |  | 3,202 |  |  | (1,739 | ) |  | 23,529 |
Interest charges | (87,469 | ) |  | (29,335 | ) |  | (11,829 | ) |  | (128,633 | )
Segment earnings (loss) before income taxes | 132,860 |  |  | 65,508 |  |  | (3,194 | ) |  | 195,174 |
Income taxes (benefit) | 40,922 |  |  | 23,836 |  |  | (1,480 | ) |  | 63,278 |
Segment earnings (loss) | 91,938 |  |  | 41,672 |  |  | (1,714 | ) |  | 131,896 |
Valencia non-controlling interest | (14,519 | ) |  | — |  |  | — |  |  | (14,519 | )
Subsidiary preferred stock dividends | (528 | ) |  | — |  |  | — |  |  | (528 | )
Segment earnings (loss) attributable to PNMR | $ | 76,891 |  |  | $ | 41,672 |  |  | $ | (1,714 | ) |  | $ | 116,849 |
At December 31, 2016: |  |  |  |  |  |  |
Total Assets | $ | 4,867,546 |  |  | $ | 1,383,223 |  |  | $ | 220,311 |  |  | $ | 6,471,080 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | — |  |  | $ | 278,297 |
2015 | PNM |  | TNMP |  | Corporate and Other |  | Consolidated
Electric operating revenues | $ | 1,131,195 |  |  | $ | 307,887 |  |  | $ | — |  |  | $ | 1,439,082 |
Cost of energy | 391,131 |  |  | 73,518 |  |  | — |  |  | 464,649 |
Utility margin | 740,064 |  |  | 234,369 |  |  | — |  |  | 974,433 |
Other operating expenses | 590,967 |  |  | 88,051 |  |  | (14,854 | ) |  | 664,164 |
Depreciation and amortization | 115,717 |  |  | 56,285 |  |  | 13,917 |  |  | 185,919 |
Operating income | 33,380 |  |  | 90,033 |  |  | 937 |  |  | 124,350 |
Interest income | 6,574 |  |  | — |  |  | (76 | ) |  | 6,498 |
Other income (deductions) | 26,914 |  |  | 3,736 |  |  | (485 | ) |  | 30,165 |
Interest charges | (79,950 | ) |  | (27,681 | ) |  | (7,229 | ) |  | (114,860 | )
Segment earnings (loss) before income taxes | (13,082 | ) |  | 66,088 |  |  | (6,853 | ) |  | 46,153 |
Income taxes (benefit) | (12,758 | ) |  | 24,125 |  |  | 3,708 |  |  | 15,075 |
Segment earnings (loss) | (324 | ) |  | 41,963 |  |  | (10,561 | ) |  | 31,078 |
Valencia non-controlling interest | (14,910 | ) |  | — |  |  | — |  |  | (14,910 | )
Subsidiary preferred stock dividends | (528 | ) |  | — |  |  | — |  |  | (528 | )
Segment earnings (loss) attributable to PNMR | $ | (15,762 | ) |  | $ | 41,963 |  |  | $ | (10,561 | ) |  | $ | 15,640 |
At December 31, 2015: |  |  |  |  |  |  |
Total Assets | $ | 4,599,344 |  |  | $ | 1,297,139 |  |  | $ | 112,845 |  |  | $ | 6,009,328 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | — |  |  | $ | 278,297 |
2014 | PNM |  | TNMP |  | Corporate and Other |  | Consolidated
Electric operating revenues | $ | 1,147,914 |  |  | $ | 287,939 |  |  | $ | — |  |  | $ | 1,435,853 |
Cost of energy | 403,626 |  |  | 67,930 |  |  | — |  |  | 471,556 |
Utility margin | 744,288 |  |  | 220,009 |  |  | — |  |  | 964,297 |
Other operating expenses | 422,051 |  |  | 84,365 |  |  | (14,450 | ) |  | 491,966 |
Depreciation and amortization | 109,524 |  |  | 50,056 |  |  | 13,054 |  |  | 172,634 |
Operating income | 212,713 |  |  | 85,588 |  |  | 1,396 |  |  | 299,697 |
Interest income | 8,557 |  |  | — |  |  | (74 | ) |  | 8,483 |
Other income (deductions) | 12,258 |  |  | 2,138 |  |  | (2,302 | ) |  | 12,094 |
Interest charges | (79,442 | ) |  | (27,396 | ) |  | (12,789 | ) |  | (119,627 | )
Segment earnings (loss) before income taxes | 154,086 |  |  | 60,330 |  |  | (13,769 | ) |  | 200,647 |
Income taxes (benefit) | 52,633 |  |  | 22,523 |  |  | (5,418 | ) |  | 69,738 |
Segment earnings (loss) | 101,453 |  |  | 37,807 |  |  | (8,351 | ) |  | 130,909 |
Valencia non-controlling interest | (14,127 | ) |  | — |  |  | — |  |  | (14,127 | )
Subsidiary preferred stock dividends | (528 | ) |  | — |  |  | — |  |  | (528 | )
Segment earnings (loss) attributable to PNMR | $ | 86,798 |  |  | $ | 37,807 |  |  | $ | (8,351 | ) |  | $ | 116,254 |
At December 31, 2014: |  |  |  |  |  |  |
Total Assets | $ | 4,453,114 |  |  | $ | 1,229,417 |  |  | $ | 107,706 |  |  | $ | 5,790,237 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | — |  |  | $ | 278,297 |
Schedule of Major Customers | Three REPs accounted for more than 10% of the electric operating revenues of TNMP, as follows:
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
REP A | 16 | % |  | 16 | % |  | 15 | %
REP B | 11 | % |  | 13 | % |  | 15 | %
REP C | 11 | % |  | 11 | % |  | 11 | %

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