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Stock-Based Compensation (Details) (USD $)
9 Months Ended
Sep. 30, 2011
years
Sep. 30, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options, Outstanding at beginning of period, Shares3,948,262 
Options, Outstanding at beginning of period, Weighted-Average Exercise Price$ 18.33 
Options, Granted, Shares0 
Options, Granted, Weighted-Average Exercise Price$ 0.00 
Options, Exercised, Shares(254,394) 
Options, Exercised, Weighted-Average Exercise Price$ 10.99 
Options, Forfeited, Shares(10,333) 
Options, Forfeited, Weighted-Average Exercise Price$ 11.26 
Options, Expired, Shares(102,338) 
Options, Expired, Weighted-Average Exercise Price$ 24.96 
Options, Outstanding at end of period, Shares3,581,197 
Options, Outstanding at end of period, Weighted-Average Exercise Price$ 18.68 
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Options, Outstanding at end of period, Aggregate Intrinsic Value$ 8,950,188[1] 
Options, Outstanding at end of period, Weighted-Average Remaining Contract Life (years)5.12 
Options, Exercisable at end of period, Shares3,045,556 
Options, Exercisable at end of period, Weighted-Average Exercise Price$ 21.97 
Options, Exercisable at end of period, Aggregate Intrinsic Value6,011,541 
Options, Exercisable at end of period, Weighted-Average Remaining Contract Life (years)4.60 
Options, Outstanding at end of period, No intrinsic value1,923,608 
Weighted-average grant date fair value options granted (dollars per share)$ 0.00$ 3.05
Total fair value of options that vested1,189,0001,027,000
Total intrinsic value of options exercised1,077,000474,000
Executive [Member] | Performance Shares [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Options / Restricted Stock available for future grant560,461 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Nonvested Restricted Stock, Granted, Shares88,913 
Stock Options [Member]
  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Options / Restricted Stock available for future grant4,820,656[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, Shares237,021 
Nonvested Restricted Stock, Nonvested at beginning of period, Weighted-Average Grant-Date Fair Value$ 9.24 
Nonvested Restricted Stock, Granted, Shares308,985 
Nonvested Restricted Stock, Granted, Weighted-Average Grant-Date Fair Value$ 13.10$ 9.37
Nonvested Restricted Stock, Vested, Shares(113,576) 
Nonvested Restricted Stock, Vested, Weighted-Average Grant-Date Fair Value$ 9.54 
Nonvested Restricted Stock, Forfeited, Shares(1,000) 
Nonvested Restricted Stock, Forfeited, Weighted-Average Grant-Date Fair Value$ 13.67 
Nonvested Restricted Stock, Nonvested at end of period, Shares431,430 
Nonvested Restricted Stock, Nonvested at end of period, Weighted-Average Grant-Date Fair Value$ 11.92 
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$ 1,084,000$ 1,365,000
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 Rate1.20%1.36%
[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.