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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 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
(400,462
)
 
$
13.47

 
 
 
 
 
Forfeited
(5,101
)
 
$
12.22

 
 
 
 
 
Expired
(238,491
)
 
$
25.69

 
 
 
 
 
Outstanding at end of period
2,558,175

 
$
19.20

 
$
8,558,342

(1) 
 
4.52 years
Exercisable at end of period
2,413,913

 
$
20.34

 
$
7,695,622

 
 
4.33 years
(1) At June 30, 2012, the exercise price of 1,356,468 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:
 
 
Six Months Ended June 30,
 
 
2012
 
2011
Weighted-average grant date fair value of options granted
 
$
—

 
$
—

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

 
$
1,189

Total intrinsic value of options exercised (in thousands)
 
$
1,917

 
$
2,199
Schedule of Nonvested Share Activity [Table Text Block]

The following table summarizes restricted stock activity, including performance-based and market-based shares, for the six months ended June 30, 2012:
 
 
Shares
 
Weighted-
Average
Grant-Date
Fair Value
Nonvested at beginning of period
 
418,730

 
$
12.36

Granted
 
320,597

 
$
15.63

Vested
 
(313,176
)
 
$
12.22

Forfeited
 
(6,837
)
 
$
12.77

Nonvested at end of period
 
419,314

 
$
14.00
Schedule of Nonvested Share Activity Additional Information [Table Text Block]
The following table provides additional information concerning restricted stock, including performance-based and market-based shares:
 
 
Six Months Ended
 
 
June 30,
 
 
2012
 
2011
Weighted-average grant date fair value of shares granted
 
$
15.63

 
$
13.10

Total fair value of shares that vested (in thousands)
 
$
3,828

 
$
1,073

Expected quarterly dividends per share
 
$
0.145

 
$
0.125

Risk-free interest rate
 
0.76
%
 
1.20
%