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Fair Value of Derivative and Other Financial Instruments, Avaialbe for Sale Securities (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	$ 157,001		$ 157,001		$ 156,922
Available-for-sale securities, Unrealized gains	18,255		18,255		26,835
Available-for-sale securities, Unrealized losses	0		0
Proceeds from sales	26,312	20,813	121,202	57,098
Gross realized gains	2,800	1,568	16,290	4,999
Gross realized (losses)	(1,847)	(1,227)	(4,129)	(3,099)
Domestic value [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	22,051		22,051		25,491
Available-for-sale securities, Unrealized gains	1,137		1,137		5,108
Domestic growth [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	47,358		47,358		48,237
Available-for-sale securities, Unrealized gains	12,356		12,356		17,239
Multinational [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	12,509		12,509		10,670
Available-for-sale securities, Unrealized gains	243		243		2,730
Municipals [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	39,316		39,316		37,595
Available-for-sale securities, Unrealized gains	2,486		2,486		837
U.S. Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	22,779		22,779		21,541
Available-for-sale securities, Unrealized gains	1,305		1,305		348
Corporate and other [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	9,292		9,292		8,402
Available-for-sale securities, Unrealized gains	728		728		573
Cash and equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Fair value	3,696		3,696		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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