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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2013
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | Information regarding accumulated other comprehensive income (loss) for the six months ended June 30, 2013 is as follows:
| Accumulated Other Comprehensive Income (Loss)
| Unrealized |  |  |  | Fair Value |  |
| Gain on |  | Pension |  | Adjustment |  |
| Investment |  | Liability |  | for Cash Flow |  |
| Securities |  | Adjustment |  | Hedges |  | Total
| (In thousands)
PNMR |  |  |  |  |  |  |
Balance at December 31, 2012 | $ | 16,406 |  |  | $ | (97,820 | ) |  | $ | (216 | ) |  | $ | (81,630 | )
Amounts reclassified from AOCI (pre-tax) | (6,854 | ) |  | 3,182 |  |  | 99 |  |  | (3,573 | )
Income tax impact of amounts reclassified | 2,714 |  |  | (1,262 | ) |  | (35 | ) |  | 1,417 |
Other OCI changes (pre-tax) | 8,591 |  |  | — |  |  | 3 |  |  | 8,594 |
Income tax impact of other OCI changes | (3,401 | ) |  | — |  |  | (1 | ) |  | (3,402 | )
Net change after income taxes | 1,050 |  |  | 1,920 |  |  | 66 |  |  | 3,036 |
Balance at June 30, 2013 | $ | 17,456 |  |  | $ | (95,900 | ) |  | $ | (150 | ) |  | $ | (78,594 | )
PNM |  |  |  |  |  |  |
Balance at December 31, 2012 | $ | 16,406 |  |  | $ | (97,820 | ) |  | $ | — |  |  | $ | (81,414 | )
Amounts reclassified from AOCI (pre-tax) | (6,854 | ) |  | 3,182 |  |  | — |  |  | (3,672 | )
Income tax impact of amounts reclassified | 2,714 |  |  | (1,262 | ) |  | — |  |  | 1,452 |
Other OCI changes (pre-tax) | 8,591 |  |  | — |  |  | — |  |  | 8,591 |
Income tax impact of other OCI changes | (3,401 | ) |  | — |  |  | — |  |  | (3,401 | )
Net change after income taxes | 1,050 |  |  | 1,920 |  |  | — |  |  | 2,970 |
Balance at June 30, 2013 | $ | 17,456 |  |  | $ | (95,900 | ) |  | $ | — |  |  | $ | (78,444 | )
TNMP |  |  |  |  |  |  |
Balance at December 31, 2012 | $ | — |  |  | $ | — |  |  | $ | (216 | ) |  | $ | (216 | )
Amounts reclassified from AOCI (pre-tax) | — |  |  | — |  |  | 99 |  |  | 99 |
Income tax impact of amounts reclassified | — |  |  | — |  |  | (35 | ) |  | (35 | )
Other OCI changes (pre-tax) | — |  |  | — |  |  | 3 |  |  | 3 |
Income tax impact of other OCI changes | — |  |  | — |  |  | (1 | ) |  | (1 | )
Net change after income taxes | — |  |  | — |  |  | 66 |  |  | 66 |
Balance at June 30, 2013 | $ | — |  |  | $ | — |  |  | $ | (150 | ) |  | $ | (150 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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