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Fair Value of Derivative and Other Financial Instruments - Available for Sale Securities (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]      
(Increase)/decrease in other than temporary losses of available-for-sale securities, net portion recognized in earnings $ 1,100,000 $ 1,600,000  
Available-for-sale securities for which carrying value exceeds fair value 0    
Held-to-maturity securities for which carrying value exceeds fair value 0    
Impairments considered to be other than temporary 0    
PNMR and PNM      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 286,099,000   $ 272,977,000
Unrealized Gains 12,406,000   7,449,000
Proceeds from sales 266,388,000 124,900,000  
Gross realized gains 8,645,000 10,716,000  
Gross realized (losses) (3,085,000) $ (6,116,000)  
PNMR and PNM | Fair Value, Measurements, Recurring      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 286,099,000   272,977,000
PNMR and PNM | Nuclear Decommissioning Trust | Fair Value, Measurements, Recurring      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 266,100,000   253,900,000
PNMR and PNM | Mine Reclamation Trust | Fair Value, Measurements, Recurring      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 20,000,000   19,100,000
PNMR and PNM | Cash and cash equivalents      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 8,047,000   23,683,000
Unrealized Gains 0   0
PNMR and PNM | Cash and cash equivalents | Fair Value, Measurements, Recurring      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 8,047,000   23,683,000
PNMR and PNM | Domestic value      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 70,043,000   34,796,000
Unrealized Gains 3,044,000   1,135,000
PNMR and PNM | Domestic value | Fair Value, Measurements, Recurring      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 70,043,000   34,796,000
PNMR and PNM | Domestic growth      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 65,127,000   47,595,000
Unrealized Gains 4,438,000   3,032,000
PNMR and PNM | Domestic growth | Fair Value, Measurements, Recurring      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 65,127,000   47,595,000
PNMR and PNM | International and other      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 36,442,000   27,481,000
Unrealized Gains 3,555,000   2,029,000
PNMR and PNM | International and other | Fair Value, Measurements, Recurring      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 36,442,000   27,481,000
PNMR and PNM | U.S. Government      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 31,410,000   40,962,000
Unrealized Gains 178,000   115,000
PNMR and PNM | U.S. Government | Fair Value, Measurements, Recurring      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 31,410,000   40,962,000
PNMR and PNM | Municipals      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 33,218,000   43,789,000
Unrealized Gains 617,000   585,000
PNMR and PNM | Municipals | Fair Value, Measurements, Recurring      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 33,218,000   43,789,000
PNMR and PNM | Corporate and other      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value 41,812,000   54,671,000
Unrealized Gains 574,000   553,000
PNMR and PNM | Corporate and other | Fair Value, Measurements, Recurring      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value $ 41,812,000   $ 54,671,000