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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Option Activity Including Exerciseable and Future Grant Information [Table Text Block]
The following table summarizes activity in stock options for the three months ended March 31, 2012:
 
Shares
 
Weighted-
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
 
Weighted-
Average
Remaining
Contract Life
Outstanding at beginning of period
3,202,229

 
$
18.95

 
 
 
 
 
Granted
—

 
$
—

 
 
 
 
 
Exercised
(368,895
)
 
$
13.57

 
 
 
 
 
Forfeited
(2,667
)
 
$
12.22

 
 
 
 
 
Expired
(234,091
)
 
$
25.65

 
 
 
 
 
Outstanding at end of period
2,596,576

 
$
19.07

 
$
8,858,517

(1) 
 
4.78 years
Exercisable at end of period
2,439,635

 
$
20.29

 
$
7,933,890

 
 
4.59 years
(1) At March 31, 2012, the exercise price of 1,360,568 outstanding stock options is greater than the closing price of PNMR common stock on that date; therefore, those options have no intrinsic value.
Schedule of Additional Stock Option Activity [Table Text Block]
The following table provides additional information concerning stock options:
 
 
Three Months Ended March 31,
 
 
2012
 
2011
Weighted-average grant date fair value of options granted
 
$
—

 
$
—

Total fair value of options that vested (in thousands)
 
$
1,058

 
$
1,179

Total intrinsic value of options exercised (in thousands)
 
$
1,722

 
$
396
Schedule of Nonvested Share Activity [Table Text Block]

The following table summarizes restricted stock activity, including performance shares, for the three months ended March 31, 2012:
 
 
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Nonvested at beginning of period
 
418,730

 
$
12.36

Granted
 
293,039

 
$
14.33

Vested
 
(264,422
)
 
$
12.22

Forfeited
 
(2,089
)
 
$
11.44

Nonvested at end of period
 
445,258

 
$
13.57
Schedule of Nonvested Share Activity Additional Information [Table Text Block]
The following table provides additional information concerning restricted stock, including performance shares:
 
 
Three Months Ended
 
 
March 31,
 
 
2012
 
2011
Weighted-average grant date fair value of shares granted
 
$
14.33

 
$
12.90

Total fair value of shares that vested (in thousands)
 
$
3,232

 
$
758

Expected quarterly dividends per share
 
$
0.145

 
$
0.125

Risk-free interest rate
 
0.43
%
 
1.20
%