Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

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	)