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Fair Value of Derivative and Other Financial Instruments, Avaialbe for Sale Securities (Details) (USD $) In Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010 | Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | $ 168,513 |  | $ 168,513 |  | $ 156,922
Available-for-sale securities, Unrealized gains | 25,109 |  | 25,109 |  | 26,835
Available-for-sale securities, Unrealized losses | 0 |  | 0 |  |
Proceeds from sales | 46,770 | 15,586 | 94,890 | 36,285 |
Gross realized gains | 8,700 | 1,526 | 13,490 | 3,431 |
Gross realized (losses) | (554) | (510) | (2,282) | (1,872) |
Domestic value [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 27,986 |  | 27,986 |  | 25,491
Available-for-sale securities, Unrealized gains | 2,525 |  | 2,525 |  | 5,108
Domestic growth [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 56,245 |  | 56,245 |  | 48,237
Available-for-sale securities, Unrealized gains | 19,453 |  | 19,453 |  | 17,239
Multinational [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 14,089 |  | 14,089 |  | 10,670
Available-for-sale securities, Unrealized gains | 405 |  | 405 |  | 2,730
Municipals [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 38,884 |  | 38,884 |  | 37,595
Available-for-sale securities, Unrealized gains | 1,630 |  | 1,630 |  | 837
U.S. Government [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 21,390 |  | 21,390 |  | 21,541
Available-for-sale securities, Unrealized gains | 490 |  | 490 |  | 348
Corporate and other [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 9,195 |  | 9,195 |  | 8,402
Available-for-sale securities, Unrealized gains | 606 |  | 606 |  | 573
Cash and equivalents [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Fair value | 724 |  | 724 |  | 4,986
Available-for-sale securities, Unrealized gains | 0 |  | 0 |  | 0
Public Service Company of New Mexico [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities, Unrealized losses | $ 0 |  | $ 0 |  |

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