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Fair Value of Derivative and Other Financial Instruments - Items Recorded and Presented by Level of Hierarchy (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
PNMR and PNM    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments $ 286,099 $ 272,977
PNMR and PNM | Cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 8,047 23,683
PNMR and PNM | Domestic value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 70,043 34,796
PNMR and PNM | Domestic growth    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 65,127 47,595
PNMR and PNM | International and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 36,442 27,481
PNMR and PNM | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 31,410 40,962
PNMR and PNM | Municipals    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 33,218 43,789
PNMR and PNM | Corporate and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 41,812 54,671
PNMR    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 2,525,916 2,540,693
Westmoreland Loan 96,444  
Westmoreland Loan   100,893
Other investments 1,051 1,164
PNMR | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 0 0
Westmoreland Loan 0  
Westmoreland Loan   0
Other investments 419 547
PNMR | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 2,525,916 2,540,693
Westmoreland Loan 0  
Westmoreland Loan   0
Other investments 0 0
PNMR | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 0 0
Westmoreland Loan 96,444  
Westmoreland Loan   100,893
Other investments 632 617
PNMR | Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 2,384,160 2,392,712
Westmoreland Loan 85,410  
Westmoreland Loan   95,000
Other investments 419 547
PNM    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 1,728,276 1,730,157
Other investments 188 316
PNM | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 0 0
Other investments 188 316
PNM | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 1,728,276 1,730,157
Other investments 0 0
PNM | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 0 0
Other investments 0 0
PNM | Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 1,631,972 1,631,369
Other investments 188 316
TNMP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 464,877 468,329
Other investments 231 231
TNMP | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 0 0
Other investments 231 231
TNMP | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 464,877 468,329
Other investments 0 0
TNMP | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 0 0
Other investments 0 0
TNMP | Carrying Amount    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt 420,950 420,875
Other investments 231 231
Fair Value, Measurements, Recurring | PNMR and PNM    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 286,099 272,977
Fair Value, Measurements, Recurring | PNMR and PNM | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 206,608 196,436
Fair Value, Measurements, Recurring | PNMR and PNM | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 79,491 76,541
Fair Value, Measurements, Recurring | PNMR and PNM | Commodity derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commodity derivative assets 4,586 5,224
Commodity derivative liabilities (360) (2,339)
Net 4,226 2,885
Fair Value, Measurements, Recurring | PNMR and PNM | Commodity derivatives | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commodity derivative assets 0 0
Commodity derivative liabilities 0 0
Net 0 0
Fair Value, Measurements, Recurring | PNMR and PNM | Commodity derivatives | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commodity derivative assets 4,586 5,224
Commodity derivative liabilities (360) (2,339)
Net 4,226 2,885
Fair Value, Measurements, Recurring | PNMR and PNM | Cash and cash equivalents    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 8,047 23,683
Fair Value, Measurements, Recurring | PNMR and PNM | Cash and cash equivalents | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 8,047 23,683
Fair Value, Measurements, Recurring | PNMR and PNM | Cash and cash equivalents | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 0
Fair Value, Measurements, Recurring | PNMR and PNM | Domestic value    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 70,043 34,796
Fair Value, Measurements, Recurring | PNMR and PNM | Domestic value | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 70,043 34,796
Fair Value, Measurements, Recurring | PNMR and PNM | Domestic value | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 0
Fair Value, Measurements, Recurring | PNMR and PNM | Domestic growth    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 65,127 47,595
Fair Value, Measurements, Recurring | PNMR and PNM | Domestic growth | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 65,127 47,595
Fair Value, Measurements, Recurring | PNMR and PNM | Domestic growth | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 0
Fair Value, Measurements, Recurring | PNMR and PNM | International and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 36,442 27,481
Fair Value, Measurements, Recurring | PNMR and PNM | International and other | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 33,212 27,481
Fair Value, Measurements, Recurring | PNMR and PNM | International and other | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 3,230 0
Fair Value, Measurements, Recurring | PNMR and PNM | U.S. Government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 31,410 40,962
Fair Value, Measurements, Recurring | PNMR and PNM | U.S. Government | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 30,179 39,723
Fair Value, Measurements, Recurring | PNMR and PNM | U.S. Government | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1,231 1,239
Fair Value, Measurements, Recurring | PNMR and PNM | Municipals    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 33,218 43,789
Fair Value, Measurements, Recurring | PNMR and PNM | Municipals | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 0
Fair Value, Measurements, Recurring | PNMR and PNM | Municipals | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 33,218 43,789
Fair Value, Measurements, Recurring | PNMR and PNM | Corporate and other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 41,812 54,671
Fair Value, Measurements, Recurring | PNMR and PNM | Corporate and other | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0 23,158
Fair Value, Measurements, Recurring | PNMR and PNM | Corporate and other | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments $ 41,812 $ 31,513