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Stock-Based Compensation (Details) (USD $)
6 Months Ended
Jun. 30, 2011
years
Jun. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Options, Outstanding at beginning of period, Shares 3,948,262  
Options, Outstanding at beginning of period, Weighted-Average Exercise Price $ 18.33  
Options, Granted, Shares 0  
Options, Granted, Weighted-Average Exercise Price $ 0.00  
Options, Exercised, Shares (199,683)  
Options, Exercised, Weighted-Average Exercise Price $ 11.01  
Options, Forfeited, Shares (8,333)  
Options, Forfeited, Weighted-Average Exercise Price $ 11.33  
Options, Expired, Shares (47,936)  
Options, Expired, Weighted-Average Exercise Price $ 24.51  
Options, Outstanding at end of period, Shares 3,692,310  
Options, Outstanding at end of period, Weighted-Average Exercise Price $ 18.66  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Options, Outstanding at end of period, Aggregate Intrinsic Value $ 9,793,593 [1]  
Options, Outstanding at end of period, Weighted-Average Remaining Contract Life (years) 5.36  
Options, Exercisable at end of period, Shares 3,152,000  
Options, Exercisable at end of period, Weighted-Average Exercise Price $ 21.86  
Options, Exercisable at end of period, Aggregate Intrinsic Value 6,663,441  
Options, Exercisable at end of period, Weighted-Average Remaining Contract Life (years) 4.85  
Options, Outstanding at end of period, No intrinsic value 1,978,010  
Weighted-average grant date fair value options granted (dollars per share) $ 0.00 $ 3.05
Total fair value of options that vested 1,189,000 1,027,000
Total intrinsic value of options exercised 2,199,000 329,000
Executive [Member] | Performance Shares [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Options / Restricted Stock available for future grant 560,461  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]    
Nonvested Restricted Stock, Granted, Shares 88,913  
Stock Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Options / Restricted Stock available for future grant 4,763,254 [2]  
Restricted Stock [Member]
   
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 237,021  
Nonvested Restricted Stock, Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value $ 9.24  
Nonvested Restricted Stock, Granted, Shares 308,985  
Nonvested Restricted Stock, Granted, Weighted-Average Grant-Date Fair Value $ 13.10 $ 9.37
Nonvested Restricted Stock, Vested, Shares (110,757)  
Nonvested Restricted Stock, Vested, Weighted-Average Grant-Date Fair Value $ 9.69  
Nonvested Restricted Stock, Forfeited, Shares 0  
Nonvested Restricted Stock, Forfeited, Weighted-Average Grant-Date Fair Value $ 0.00  
Nonvested Restricted Stock, Nonvested at end of period, Shares 435,249  
Nonvested Restricted Stock, Nonvested at end of period, Weighted-Average Grant-Date Fair Value $ 11.91  
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 $ 1,073,000 $ 1,308,000
Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions Expected Quarterly Dividend Rate $ 0.125 $ 0.125
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 1.20% 1.36%
[1] At June 30, 2011, the exercise price of 1,978,010 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.