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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2011
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 option plans for the nine months ended September 30, 2011:
 
Shares
 
Weighted-
Average
Exercise
Price
 
Aggregate
Intrinsic
Value
 
Weighted-
Average
Remaining
Contract Life
Outstanding at beginning of period
3,948,262

 
$
18.33

 
 
 
 
 
Granted
—

 
$
—

 
 
 
 
 
Exercised
(254,394
)
 
$
10.99

 
 
 
 
 
Forfeited
(10,333
)
 
$
11.26

 
 
 
 
 
Expired
(102,338
)
 
$
24.96

 
 
 
 
 
Outstanding at end of period
3,581,197

 
$
18.68

 
$
8,950,188

(1) 
 
5.12 years
Exercisable at end of period
3,045,556

 
$
21.97

 
$
6,011,541

 
 
4.60 years
Options available for future grant(2)
4,820,656

 
 
 
 
 
 
 

(1) At September 30, 2011, the exercise price of 1,923,608 outstanding stock options is greater than the closing price of PNMR common stock on that date; therefore, those options have no intrinsic value.
(2) Includes shares available for grants of restricted stock.

Schedule of Additional Stock Option Activity [Table Text Block]
The following table provides additional information concerning stock option activity:
 
 
Nine Months Ended
September 30,
Options for PNMR Common Stock
 
2011
 
2010
Weighted-average grant date fair value of options granted
 
$
—

 
$
3.05

Total fair value of options that vested (in thousands)
 
$
1,189

 
$
1,027

Total intrinsic value of options exercised (in thousands)
 
$
1,077

 
$
474

Schedule of Nonvested Share Activity [Table Text Block]
The following table summarizes nonvested restricted stock activity for the nine months ended September 30, 2011:

Nonvested Restricted Stock
 
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Nonvested at beginning of period
 
237,021

 
$
9.24

Granted
 
308,985

 
$
13.10

Vested
 
(113,576
)
 
$
9.54

Forfeited
 
(1,000
)
 
$
13.67

Nonvested at end of period
 
431,430

 
$
11.92

Schedule of Nonvested Share Activity Additional Information [Table Text Block]
The following table provides additional information concerning restricted stock:
 
 
Nine Months Ended
 
 
September 30,
Nonvested Restricted Stock
 
2011
 
2010
Weighted-average grant date fair value of shares granted
 
$
13.10

 
$
9.37

Total fair value of shares that vested (in thousands)
 
$
1,084

 
$
1,365

Expected quarterly dividends per share
 
$
0.125

 
$
0.125

Risk-free interest rate
 
1.20
%
 
1.36
%