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Segment Information (Tables) | 12 Months Ended
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Dec. 31, 2012
Segment Reporting [Abstract] |
Schedule of Segment Reporting Information, by Segment [Table Text Block] | PNMR SEGMENT INFORMATION
2012 | PNM |  | TNMP |  | Corporate and Other |  | Consolidated
| (In thousands)
Electric operating revenues | $ | 1,092,264 |  |  | $ | 250,140 |  |  | $ | (1 | ) |  | $ | 1,342,403 |
Cost of energy | 353,649 |  |  | 46,201 |  |  | — |  |  | 399,850 |
Margin | 738,615 |  |  | 203,939 |  |  | (1 | ) |  | 942,553 |
Other operating expenses | 435,442 |  |  | 87,079 |  |  | (17,862 | ) |  | 504,659 |
Depreciation and amortization | 97,291 |  |  | 49,340 |  |  | 17,542 |  |  | 164,173 |
Operating income | 205,882 |  |  | 67,520 |  |  | 319 |  |  | 273,721 |
Interest income | 13,243 |  |  | 1 |  |  | (172 | ) |  | 13,072 |
Gain on sale of First Choice | — |  |  | — |  |  | 1,012 |  |  | 1,012 |
Other income (deductions) | 13,290 |  |  | 2,739 |  |  | (7,954 | ) |  | 8,075 |
Net interest charges | (76,101 | ) |  | (28,161 | ) |  | (16,583 | ) |  | (120,845 | )
Earnings (loss) before income taxes | 156,314 |  |  | 42,099 |  |  | (23,378 | ) |  | 175,035 |
Income taxes | 50,713 |  |  | 15,352 |  |  | (11,155 | ) |  | 54,910 |
Earnings (loss) from continuing operations | 105,601 |  |  | 26,747 |  |  | (12,223 | ) |  | 120,125 |
Valencia non-controlling interest | (14,050 | ) |  | — |  |  | — |  |  | (14,050 | )
Subsidiary preferred stock dividends | (528 | ) |  | — |  |  | — |  |  | (528 | )
Segment earnings (loss) from continuing operations attributable to PNMR | $ | 91,023 |  |  | $ | 26,747 |  |  | $ | (12,223 | ) |  | $ | 105,547 |
Gross property additions | $ | 196,800 |  |  | $ | 92,973 |  |  | $ | 19,136 |  |  | $ | 308,909 |
At December 31, 2012: |  |  |  |  |  |  |
Total Assets | $ | 4,163,907 |  |  | $ | 1,086,229 |  |  | $ | 122,447 |  |  | $ | 5,372,583 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | — |  |  | $ | 278,297 |
Additions to utility plant and non-utility plant included in accounts payable | $ | 7,083 |  |  | $ | 1,987 |  |  | $ | 6,602 |  |  | $ | 15,672 |
2011 | PNM |  | TNMP |  | First Choice |  | Corporate and Other |  | Consolidated
|  |  |  |  | (In thousands) |  |  |  |
Operating revenues | $ | 1,057,289 |  |  | $ | 204,045 |  |  | $ | 439,450 |  |  | $ | (165 | ) |  | $ | 1,700,619 |
Intersegment revenues | — |  |  | 33,813 |  |  | — |  |  | (33,813 | ) |  | — |
Total revenues | 1,057,289 |  |  | 237,858 |  |  | 439,450 |  |  | (33,978 | ) |  | 1,700,619 |
Cost of energy | 362,237 |  |  | 41,166 |  |  | 323,331 |  |  | (33,812 | ) |  | 692,922 |
Margin | 695,052 |  |  | 196,692 |  |  | 116,119 |  |  | (166 | ) |  | 1,007,697 |
Other operating expenses | 438,822 |  |  | 88,234 |  |  | 75,966 |  |  | (9,671 | ) |  | 593,351 |
Depreciation and amortization | 94,787 |  |  | 44,616 |  |  | 1,098 |  |  | 16,546 |  |  | 157,047 |
Operating income (loss) | 161,443 |  |  | 63,842 |  |  | 39,055 |  |  | (7,041 | ) |  | 257,299 |
Interest income | 15,562 |  |  | 2 |  |  | 64 |  |  | (113 | ) |  | 15,515 |
Gain on sale of First Choice | — |  |  | — |  |  | — |  |  | 174,925 |  |  | 174,925 |
Other income (deductions) | 4,309 |  |  | 1,580 |  |  | (650 | ) |  | (15,660 | ) |  | (10,421 | )
Net interest charges | (75,349 | ) |  | (29,286 | ) |  | (581 | ) |  | (19,633 | ) |  | (124,849 | )
Earnings (loss) before income taxes | 105,965 |  |  | 36,138 |  |  | 37,888 |  |  | 132,478 |  |  | 312,469 |
Income taxes (benefit) | 37,427 |  |  | 13,881 |  |  | 13,772 |  |  | 56,455 |  |  | 121,535 |
Earnings (loss) from continuing operations | 68,538 |  |  | 22,257 |  |  | 24,116 |  |  | 76,023 |  |  | 190,934 |
Valencia non-controlling interest | (14,047 | ) |  | — |  |  | — |  |  | — |  |  | (14,047 | )
Subsidiary preferred stock dividends | (528 | ) |  | — |  |  | — |  |  | — |  |  | (528 | )
Segment earnings (loss) from continuing operations attributable to PNMR | $ | 53,963 |  |  | $ | 22,257 |  |  | $ | 24,116 |  |  | $ | 76,023 |  |  | $ | 176,359 |
Gross property additions | $ | 251,345 |  |  | $ | 67,407 |  |  | $ | 2,089 |  |  | $ | 6,090 |  |  | $ | 326,931 |
At December 31, 2011: |  |  |  |  |  |  |  |  |
Total Assets | $ | 4,095,287 |  |  | $ | 1,037,445 |  |  | $ | — |  |  | $ | 71,881 |  |  | $ | 5,204,613 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | — |  |  | $ | — |  |  | $ | 278,297 |
Additions to utility plant and non-utility plant included in accounts payable | $ | 26,815 |  |  | $ | 4,736 |  |  | $ | — |  |  | $ | 2,104 |  |  | $ | 33,655 |
2010 | PNM |  | TNMP |  | First Choice |  | Corporate and Other |  | Consolidated
|  |  |  |  | (In thousands) |  |  |  |
Operating revenues | $ | 1,017,128 |  |  | $ | 173,504 |  |  | $ | 483,203 |  |  | $ | (318 | ) |  | $ | 1,673,517 |
Intersegment revenues | — |  |  | 39,084 |  |  | — |  |  | (39,084 | ) |  | — |
Total revenues | 1,017,128 |  |  | 212,588 |  |  | 483,203 |  |  | (39,402 | ) |  | 1,673,517 |
Cost of energy | 352,270 |  |  | 37,064 |  |  | 350,476 |  |  | (39,083 | ) |  | 700,727 |
Margin | 664,858 |  |  | 175,524 |  |  | 132,727 |  |  | (319 | ) |  | 972,790 |
Other operating expenses | 424,455 |  |  | 77,387 |  |  | 92,077 |  |  | (12,285 | ) |  | 581,634 |
Depreciation and amortization | 92,281 |  |  | 41,726 |  |  | 864 |  |  | 16,833 |  |  | 151,704 |
Operating income (loss) | 148,122 |  |  | 56,411 |  |  | 39,786 |  |  | (4,867 | ) |  | 239,452 |
Interest income | 18,854 |  |  | 1 |  |  | 18 |  |  | 23 |  |  | 18,896 |
Equity in net earnings (loss) of Optim Energy | — |  |  | — |  |  | — |  |  | (203,399 | ) |  | (203,399 | )
Other income (deductions) | 12,712 |  |  | 771 |  |  | (411 | ) |  | (6,027 | ) |  | 7,045 |
Net interest charges | (72,400 | ) |  | (31,157 | ) |  | (1,268 | ) |  | (20,548 | ) |  | (125,373 | )
Earnings (loss) before income taxes | 107,288 |  |  | 26,026 |  |  | 38,125 |  |  | (234,818 | ) |  | (63,379 | )
Income taxes (benefit) | 36,427 |  |  | 10,044 |  |  | 14,064 |  |  | (92,790 | ) |  | (32,255 | )
Earnings (loss) from continuing operations | 70,861 |  |  | 15,982 |  |  | 24,061 |  |  | (142,028 | ) |  | (31,124 | )
Valencia non-controlling interest | (13,563 | ) |  | — |  |  | — |  |  | — |  |  | (13,563 | )
Subsidiary preferred stock dividends | (528 | ) |  | — |  |  | — |  |  | — |  |  | (528 | )
Segment earnings (loss) from continuing operations attributable to PNMR | $ | 56,770 |  |  | $ | 15,982 |  |  | $ | 24,061 |  |  | $ | (142,028 | ) |  | $ | (45,215 | )
Gross property additions | $ | 226,766 |  |  | $ | 41,018 |  |  | $ | 3,046 |  |  | $ | 10,658 |  |  | $ | 281,488 |
At December 31, 2010: |  |  |  |  |  |  |  |  |
Total Assets | $ | 3,875,573 |  |  | $ | 1,010,957 |  |  | $ | 218,411 |  |  | $ | 120,142 |  |  | $ | 5,225,083 |
Goodwill | $ | 51,632 |  |  | $ | 226,665 |  |  | $ | 43,013 |  |  | $ | — |  |  | $ | 321,310 |

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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 131 -Paragraph 27, 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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=6534315&loc=d3e8906-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8721-108599 + Details
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