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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] | AOCI reports a measure for accumulated changes in equity that result from transactions and other economic events other than transactions with shareholders. The following table sets forth each component of AOCI, net of income taxes:
| Unrealized gain on securities |  | Pension liability adjustment |  | Mark-to- market for cash-flow hedge transactions |  | Accumulated other comprehensive income (loss)
|  |  | (In thousands) |  |
PNMR |  |  |  |  |  |  |
Balance at December 31, 2011 | $ | 15,634 |  |  | $ | (82,432 | ) |  | $ | (58 | ) |  | $ | (66,856 | )
Balance at December 31, 2010 | $ | 16,211 |  |  | $ | (83,254 | ) |  | $ | (1,623 | ) |  | $ | (68,666 | )
PNM |  |  |  |  |  |  |
Balance at December 31, 2011 | $ | 15,634 |  |  | $ | (82,432 | ) |  | $ | — |  |  | $ | (66,798 | )
Balance at December 31, 2010 | $ | 16,211 |  |  | $ | (82,981 | ) |  | $ | (16 | ) |  | $ | (66,786 | )
TNMP |  |  |  |  |  |  |
Balance at December 31, 2011 | $ | — |  |  | $ | — |  |  | $ | (58 | ) |  | $ | (58 | )
Balance at December 31, 2010 | $ | — |  |  | $ | (275 | ) |  | $ | (1,210 | ) |  | $ | (1,485 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References No definition available. + Details
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