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Stock-Based Compensation (Details) (USD $)
6 Months Ended 12 Months Ended
Jun. 30, 2012
Y
Jun. 30, 2011
Jun. 30, 2012
Restricted Stock [Member]
Jun. 30, 2011
Restricted Stock [Member]
Dec. 31, 2011
Executive [Member]
Performance Shares [Member]
Dec. 31, 2009
Executive [Member]
Performance Shares [Member]
Jun. 30, 2012
Executive [Member]
Performance Shares [Member]
Jun. 30, 2012
Achieves a specified improvement in total shareholder return at the end of 2016 compared to 2011 and she remains an employee [Member]
Common Stock [Member]
Chairman, President, and Chief Executive Officer [Member]
Jun. 30, 2012
Achieves a specified improvement in total shareholder return at the end of 2014 compared to 2011 and she remains an employee [Member]
Common Stock [Member]
Chairman, President, and Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]                  
Options, Outstanding at beginning of period, Shares 3,202,229                
Options, Outstanding at beginning of period, Weighted-Average Exercise Price $ 18.95                
Options, Granted, Shares 0                
Options, Granted, Weighted-Average Exercise Price $ 0.00                
Options, Exercised, Shares (400,462)                
Options, Exercised, Weighted-Average Exercise Price $ 13.47                
Options, Forfeited, Shares (5,101)                
Options, Forfeited, Weighted-Average Exercise Price $ 12.22                
Options, Expired, Shares (238,491)                
Options, Expired, Weighted-Average Exercise Price $ 25.69                
Options, Outstanding at end of period, Shares 2,558,175                
Options, Outstanding at end of period, Weighted-Average Exercise Price $ 19.20                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]                  
Options, Outstanding at end of period, Aggregate Intrinsic Value $ 8,558,342 [1]                
Options, Outstanding at end of period, Weighted-Average Remaining Contract Life (years) 4.52                
Options, Exercisable at end of period, Shares 2,413,913                
Options, Exercisable at end of period, Weighted-Average Exercise Price $ 20.34                
Options, Exercisable at end of period, Aggregate Intrinsic Value 7,695,622                
Options, Exercisable at end of period, Weighted-Average Remaining Contract Life (years) 4.33                
Options, Outstanding at end of period, No intrinsic value 1,356,468                
Weighted-average grant date fair value options granted (dollars per share) $ 0.00 $ 0.00              
Total fair value of options that vested 1,058,000 1,189,000              
Total intrinsic value of options exercised 1,917,000 2,199,000              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]                  
Nonvested Restricted Stock, Nonvested at beginning of period, Shares     418,730            
Nonvested Restricted Stock, Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value     $ 12.36            
Nonvested Restricted Stock, Granted, Shares     320,597            
Nonvested Restricted Stock, Granted, Weighted-Average Grant-Date Fair Value     $ 15.63 $ 13.10          
Nonvested Restricted Stock, Vested, Shares     (313,176)            
Nonvested Restricted Stock, Vested, Weighted-Average Grant-Date Fair Value     $ 12.22            
Nonvested Restricted Stock, Forfeited, Shares     (6,837)            
Nonvested Restricted Stock, Forfeited, Weighted-Average Grant-Date Fair Value     $ 12.77            
Nonvested Restricted Stock, Nonvested at end of period, Shares     419,314            
Nonvested Restricted Stock, Nonvested at end of period, Weighted-Average Grant-Date Fair Value     $ 14.00            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]                  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value     $ 3,828,000 $ 1,073,000          
Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Expected Quarterly Dividend Rate     $ 0.145 $ 0.125          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate     0.76% 1.20%          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted and Vested in Period         117,174 42,768      
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year One             169,732    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year Two             193,712    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares in Year Three             212,902    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares received if achieves specified improvement in total shareholders return               135,000 35,000
[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.