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Fair Value of Derivative and Other Financial Instruments - Available for Sale Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]          
(Increase)/Decrease in other than temporary losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities $ (700) $ (1,200) $ 900 $ (800)  
PNMR and PNM [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 264,669   264,669   $ 259,042
Unrealized Gains 21,988   21,988   28,820
Proceeds from sales 69,115 62,670 194,014 94,522  
Gross realized gains 9,531 8,329 20,247 13,465  
Gross realized (losses) (4,233) $ (1,578) (10,349) $ (3,119)  
PNMR and PNM [Member] | Fair Value, Measurements, Recurring [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 264,669   264,669   259,042
PNMR and PNM [Member] | Nuclear Decommissioning Trust [Member] | Fair Value, Measurements, Recurring [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 254,400   254,400   249,100
PNMR and PNM [Member] | Mine Reclamation Trust [Member] | Fair Value, Measurements, Recurring [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 10,300   10,300   9,900
PNMR and PNM [Member] | Cash and equivalents [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 3,535   3,535   10,700
Unrealized Gains 0   0   0
PNMR and PNM [Member] | Cash and equivalents [Member] | Fair Value, Measurements, Recurring [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 3,535   3,535   10,700
PNMR and PNM [Member] | Domestic value [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 61,672   61,672   44,505
Unrealized Gains 7,517   7,517   11,610
PNMR and PNM [Member] | Domestic value [Member] | Fair Value, Measurements, Recurring [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 61,672   61,672   44,505
PNMR and PNM [Member] | Domestic growth [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 45,484   45,484   61,078
Unrealized Gains 4,977   4,977   11,163
PNMR and PNM [Member] | Domestic growth [Member] | Fair Value, Measurements, Recurring [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 45,484   45,484   61,078
PNMR and PNM [Member] | International and other [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 26,413   26,413   27,961
Unrealized Gains 1,937   1,937   1,569
PNMR and PNM [Member] | International and other [Member] | Fair Value, Measurements, Recurring [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 26,413   26,413   27,961
PNMR and PNM [Member] | U.S. Government [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 38,263   38,263   27,880
Unrealized Gains 1,293   1,293   178
PNMR and PNM [Member] | U.S. Government [Member] | Fair Value, Measurements, Recurring [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 38,263   38,263   27,880
PNMR and PNM [Member] | Municipals [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 56,078   56,078   58,576
Unrealized Gains 3,843   3,843   3,672
PNMR and PNM [Member] | Municipals [Member] | Fair Value, Measurements, Recurring [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 56,078   56,078   58,576
PNMR and PNM [Member] | Corporate and other [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value 33,224   33,224   28,342
Unrealized Gains 2,421   2,421   628
PNMR and PNM [Member] | Corporate and other [Member] | Fair Value, Measurements, Recurring [Member]          
Schedule of Available-for-sale Securities [Line Items]          
Fair Value $ 33,224   $ 33,224   $ 28,342