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Accumulated Other Comprehensive Income (Loss) (Tables)
3 Months Ended
Mar. 31, 2013
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Information regarding accumulated other comprehensive income (loss) for the three months ended March 31, 2013 is as follows:
 
Accumulated Other Comprehensive Income (Loss)
 
Unrealized
 
 
 
Fair Value
 
 
 
Gain on
 
Pension
 
Adjustment
 
 
 
Investment
 
Liability
 
for Cash Flow
 
 
 
Securities
 
Adjustment
 
Hedges
 
Total
 
(In thousands)
PNMR
 
 
 
 
 
 
 
Balance at December 31, 2012
$
16,406

 
$
(97,820
)
 
$
(216
)
 
$
(81,630
)
 Amounts reclassified from AOCI (pre-tax)
(1,336
)
 
1,591

 
48

 
303

Income tax impact of amounts reclassified
529

 
(631
)
 
(17
)
 
(119
)
 Other OCI changes (pre-tax)
7,858

 

 
12

 
7,870

Income tax impact of other OCI changes
(3,111
)
 

 
(4
)
 
(3,115
)
Net change after income taxes
3,940

 
960

 
39

 
4,939

Balance at March 31, 2013
$
20,346

 
$
(96,860
)
 
$
(177
)
 
$
(76,691
)
PNM
 
 
 
 
 
 
 
Balance at December 31, 2012
$
16,406

 
$
(97,820
)
 
$

 
$
(81,414
)
 Amounts reclassified from AOCI (pre-tax)
(1,336
)
 
1,591

 

 
255

Income tax impact of amounts reclassified
529

 
(631
)
 

 
(102
)
 Other OCI changes (pre-tax)
7,858

 

 

 
7,858

Income tax impact of other OCI changes
(3,111
)
 

 

 
(3,111
)
Net change after income taxes
3,940

 
960

 

 
4,900

Balance at March 31, 2013
$
20,346

 
$
(96,860
)
 
$

 
$
(76,514
)
TNMP
 
 
 
 
 
 
 
Balance at December 31, 2012
$

 
$

 
$
(216
)
 
$
(216
)
 Amounts reclassified from AOCI (pre-tax)

 

 
48

 
48

Income tax impact of amounts reclassified

 

 
(17
)
 
(17
)
 Other OCI changes (pre-tax)

 

 
12

 
12

Income tax impact of other OCI changes

 

 
(4
)
 
(4
)
Net change after income taxes

 

 
39

 
39

Balance at March 31, 2013
$

 
$

 
$
(177
)
 
$
(177
)