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Fair Value of Derivative and Other Financial Instruments, Avaialbe for Sale Securities (Details) (PNMR and PNM [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | $ 178,834 |  | $ 178,834 |  | $ 168,851
Available-for-sale securities, Unrealized gains | 30,676 |  | 30,676 |  | 25,881
Proceeds from sales | 19,027 | 46,770 | 45,787 | 94,890 |
Gross realized gains | 2,434 | 8,700 | 4,766 | 13,490 |
Gross realized (losses) | (1,186) | (554) | (1,925) | (2,282) |
Domestic value [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 27,188 |  | 27,188 |  | 25,143
Available-for-sale securities, Unrealized gains | 3,934 |  | 3,934 |  | 3,549
Domestic growth [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 58,427 |  | 58,427 |  | 52,187
Available-for-sale securities, Unrealized gains | 20,298 |  | 20,298 |  | 16,714
Multinational [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 11,398 |  | 11,398 |  | 12,754
Available-for-sale securities, Unrealized gains | 446 |  | 446 |  | 662
Municipals [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 43,007 |  | 43,007 |  | 41,463
Available-for-sale securities, Unrealized gains | 3,548 |  | 3,548 |  | 2,861
U.S. Government [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 24,986 |  | 24,986 |  | 25,367
Available-for-sale securities, Unrealized gains | 1,465 |  | 1,465 |  | 1,353
Corporate and other [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 10,959 |  | 10,959 |  | 9,171
Available-for-sale securities, Unrealized gains | 985 |  | 985 |  | 742
Cash and equivalents [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 2,869 |  | 2,869 |  | 2,766
Available-for-sale securities, Unrealized gains | $ 0 |  | $ 0 |  | $ 0

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