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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

X

- Definition

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

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