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Segment Information | 3 Months Ended
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Mar. 31, 2016
Segment Reporting [Abstract] |
Segment Information | Segment Information The following segment presentation is based on the methodology that management uses for making operating decisions and assessing performance of its various business activities. A reconciliation of the segment presentation to the GAAP financial statements is provided. PNM PNM includes the retail electric utility operations of PNM that are subject to traditional rate regulation by the NMPRC. PNM provides integrated electricity services that include the generation, transmission, and distribution of electricity for retail electric customers in New Mexico. PNM also provides generation service to firm-requirements wholesale customers and sells electricity into the wholesale market, as well as providing transmission services to third parties. The sale of electricity into the wholesale market includes the optimization of PNM’s jurisdictional capacity, as well as the capacity from PVNGS Unit 3, which currently is not included in retail rates. FERC has jurisdiction over wholesale and transmission rates. TNMP TNMP is an electric utility providing regulated transmission and distribution services in Texas under the TECA. TNMP’s operations are subject to traditional rate regulation by the PUCT. Corporate and Other The Corporate and Other segment includes PNMR holding company activities, primarily related to corporate level debt and PNMR Services Company. The activities of PNMR Development and NM Capital are also included in Corporate and Other. The following tables present summarized financial information for PNMR by segment. PNM and TNMP each operate in only one segment. Therefore, tabular segment information is not presented for PNM and TNMP. PNMR SEGMENT INFORMATION
| PNM |  | TNMP |  | Corporate and Other |  | Consolidated
| (In thousands)
Three Months Ended March 31, 2016 |
Electric operating revenues | $ | 235,606 |  |  | $ | 75,355 |  |  | $ | — |  |  | $ | 310,961 |
Cost of energy | 72,444 |  |  | 19,925 |  |  | — |  |  | 92,369 |
Utility margin | 163,162 |  |  | 55,430 |  |  | — |  |  | 218,592 |
Other operating expenses | 108,001 |  |  | 22,368 |  |  | (3,114 | ) |  | 127,255 |
Depreciation and amortization | 31,864 |  |  | 14,508 |  |  | 3,457 |  |  | 49,829 |
Operating income | 23,297 |  |  | 18,554 |  |  | (343 | ) |  | 41,508 |
Interest income | 1,522 |  |  | — |  |  | 2,100 |  |  | 3,622 |
Other income (deductions) | 7,943 |  |  | 608 |  |  | (1,068 | ) |  | 7,483 |
Net interest charges | (21,591 | ) |  | (7,369 | ) |  | (2,531 | ) |  | (31,491 | )
Segment earnings (loss) before income taxes | 11,171 |  |  | 11,793 |  |  | (1,842 | ) |  | 21,122 |
Income taxes | 3,610 |  |  | 4,337 |  |  | (790 | ) |  | 7,157 |
Segment earnings (loss) | 7,561 |  |  | 7,456 |  |  | (1,052 | ) |  | 13,965 |
Valencia non-controlling interest | (3,287 | ) |  | — |  |  | — |  |  | (3,287 | )
Subsidiary preferred stock dividends | (132 | ) |  | — |  |  | — |  |  | (132 | )
Segment earnings (loss) attributable to PNMR | $ | 4,142 |  |  | $ | 7,456 |  |  | $ | (1,052 | ) |  | $ | 10,546 |
At March 31, 2016: |  |  |  |  |  |  |
Total Assets | $ | 4,719,346 |  |  | $ | 1,312,402 |  |  | $ | 242,064 |  |  | $ | 6,273,812 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | — |  |  | $ | 278,297 |
| PNM |  | TNMP |  | Corporate and Other |  | Consolidated
| (In thousands)
Three Months Ended March 31, 2015 |  |  |  |  |  |  |
Electric operating revenues | $ | 261,940 |  |  | $ | 70,928 |  |  | $ | — |  |  | $ | 332,868 |
Cost of energy | 97,866 |  |  | 17,779 |  |  | — |  |  | 115,645 |
Utility margin | 164,074 |  |  | 53,149 |  |  | — |  |  | 217,223 |
Other operating expenses | 104,016 |  |  | 21,760 |  |  | (3,583 | ) |  | 122,193 |
Depreciation and amortization | 28,403 |  |  | 13,458 |  |  | 3,600 |  |  | 45,461 |
Operating income | 31,655 |  |  | 17,931 |  |  | (17 | ) |  | 49,569 |
Interest income | 1,771 |  |  | — |  |  | (21 | ) |  | 1,750 |
Other income (deductions) | 5,810 |  |  | 1,291 |  |  | (1,778 | ) |  | 5,323 |
Net interest charges | (19,959 | ) |  | (6,925 | ) |  | (3,389 | ) |  | (30,273 | )
Segment earnings (loss) before income taxes | 19,277 |  |  | 12,297 |  |  | (5,205 | ) |  | 26,369 |
Income taxes (benefit) | 5,775 |  |  | 4,603 |  |  | (1,861 | ) |  | 8,517 |
Segment earnings (loss) | 13,502 |  |  | 7,694 |  |  | (3,344 | ) |  | 17,852 |
Valencia non-controlling interest | (3,380 | ) |  | — |  |  | — |  |  | (3,380 | )
Subsidiary preferred stock dividends | (132 | ) |  | — |  |  | — |  |  | (132 | )
Segment earnings (loss) attributable to PNMR | $ | 9,990 |  |  | $ | 7,694 |  |  | $ | (3,344 | ) |  | $ | 14,340 |
At March 31, 2015: |  |  |  |  |  |  |
Total Assets | $ | 4,444,290 |  |  | $ | 1,232,687 |  |  | $ | 223,629 |  |  | $ | 5,900,606 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | — |  |  | $ | 278,297 |
At December 31, 2015, the Company adopted ASU 2015-03 – Interest – Imputation of Interest (Subtopic 835-30) and ASU 2015-17, Income Taxes (Topic 740) - Balance Sheet Classification of Deferred Taxes, which require that debt issuance costs be reflected as a direct reduction of the related debt liability, except for arrangements such as the Company’s revolving credit facilities, and eliminated the requirement to classify deferred tax assets and liabilities as non-current or current. The Company applied the updates retrospectively to make all periods comparable. As a result, amounts previously reported as total assets at March 31, 2015 above have been reduced to reflect the reclassifications aggregating $38.7 million for PNMR, $20.2 million for PNM, and $10.7 million for TNMP.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8981-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9038-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8971-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8595-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8933-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8844-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8984-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9031-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8538-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8864-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8924-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e8906-108599 + Details
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