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Quarterly Operating Results (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Data [Abstract] |
Schedule of Quarterly Financial Information [Table Text Block] | Unaudited operating results by quarters for 2012 and 2011 are presented below. In the opinion of management of the Company, all adjustments (consisting of normal recurring accruals) necessary for a fair statement of the results of operations for such periods have been included.
| Quarter Ended
| March 31 |  | June 30 |  | September 30 |  | December 31
| (In thousands, except per share amounts)
PNMR |  |  |  |  |  |  |
2012 |  |  |  |  |  |  |
Operating revenues | $ | 305,374 |  |  | $ | 323,860 |  |  | $ | 390,411 |  |  | $ | 322,758 |
Operating income | 53,729 |  |  | 65,106 |  |  | 118,150 |  |  | 36,736 |
Net earnings | 20,477 |  |  | 25,099 |  |  | 61,976 |  |  | 12,573 |
Net earnings attributable to PNMR | 17,080 |  |  | 21,512 |  |  | 57,864 |  |  | 9,091 |
Net Earnings Attributable to PNMR per Common Share: |  |  |  |  |  |  |
Basic | 0.21 |  |  | 0.27 |  |  | 0.73 |  |  | 0.11 |
Diluted | 0.21 |  |  | 0.27 |  |  | 0.72 |  |  | 0.11 |
2011 |  |  |  |  |  |  |
Operating revenues | $ | 387,663 |  |  | $ | 415,586 |  |  | $ | 549,498 |  |  | $ | 347,872 |
Operating income | 52,220 |  |  | 32,860 |  |  | 108,284 |  |  | 63,935 |
Net earnings(1) | 19,952 |  |  | 7,669 |  |  | 47,905 |  |  | 115,408 |
Net earnings attributable to PNMR | 16,637 |  |  | 4,067 |  |  | 43,662 |  |  | 111,993 |
Net Earnings Attributable to PNMR per Common Share: |  |  |  |  |  |  |
Basic | 0.18 |  |  | 0.04 |  |  | 0.48 |  |  | 1.36 |
Diluted | 0.18 |  |  | 0.04 |  |  | 0.48 |  |  | 1.35 |
PNM |  |  |  |  |  |  |
2012 |  |  |  |  |  |  |
Operating revenues | $ | 250,416 |  |  | $ | 260,094 |  |  | $ | 321,731 |  |  | $ | 260,023 |
Operating income | 42,105 |  |  | 46,669 |  |  | 96,973 |  |  | 20,135 |
Net earnings | 21,077 |  |  | 20,340 |  |  | 54,891 |  |  | 9,293 |
Net earnings attributable to PNM | 17,812 |  |  | 16,885 |  |  | 50,911 |  |  | 5,943 |
2011 |  |  |  |  |  |  |
Operating revenues | $ | 234,238 |  |  | $ | 239,234 |  |  | $ | 323,760 |  |  | $ | 260,057 |
Operating income | 18,165 |  |  | 10,543 |  |  | 87,914 |  |  | 44,821 |
Net earnings | 6,964 |  |  | 2,097 |  |  | 42,572 |  |  | 16,905 |
Net earnings (loss) attributable to PNM | 3,781 |  |  | (1,373 | ) |  | 38,461 |  |  | 13,622 |
TNMP |  |  |  |  |  |  |
2012 |  |  |  |  |  |  |
Operating revenues | $ | 54,958 |  |  | $ | 63,766 |  |  | $ | 68,680 |  |  | $ | 62,736 |
Operating income | 11,791 |  |  | 18,897 |  |  | 20,970 |  |  | 15,862 |
Net earnings | 3,011 |  |  | 8,018 |  |  | 9,084 |  |  | 6,634 |
2011 |  |  |  |  |  |  |
Operating revenues | $ | 53,842 |  |  | $ | 59,957 |  |  | $ | 66,983 |  |  | $ | 57,076 |
Operating income | 13,724 |  |  | 13,695 |  |  | 21,551 |  |  | 14,872 |
Net earnings | 4,163 |  |  | 4,102 |  |  | 8,868 |  |  | 5,124 |
(1) During the fourth quarter of 2011, PNMR completed the sale of First Choice which resulted in a $174.9 million ($97.0 million after-tax) gain, that positively affected net earnings, net earnings attributable to PNMR, and earnings per share. See Note 3.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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