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Lease Commitments - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Lease, Cost [Line Items]    
Operating lease cost: $ 7,725 $ 24,051
Less: amounts capitalized (949) (2,964)
Total operating lease expense 6,776 21,087
Financing lease cost:    
Amortization of right-of-use assets 274 556
Interest on lease liabilities 54 117
Less: amounts capitalized (195) (391)
Total financing lease expense 133 282
Variable lease expense 32 64
Short-term lease expense 68 263
Total lease expense for the period 7,009 21,696
PNM    
Lease, Cost [Line Items]    
Operating lease cost: 6,873 21,260
Less: amounts capitalized (319) (1,015)
Total operating lease expense 6,554 20,245
Financing lease cost:    
Amortization of right-of-use assets 143 286
Interest on lease liabilities 26 56
Less: amounts capitalized (81) (158)
Total financing lease expense 88 184
Variable lease expense 32 64
Short-term lease expense 63 212
Total lease expense for the period 6,737 20,705
TNMP    
Lease, Cost [Line Items]    
Operating lease cost: 726 2,439
Less: amounts capitalized (630) (1,949)
Total operating lease expense 96 490
Financing lease cost:    
Amortization of right-of-use assets 125 264
Interest on lease liabilities 27 61
Less: amounts capitalized (114) (233)
Total financing lease expense 38 92
Variable lease expense 0 0
Short-term lease expense 5 10
Total lease expense for the period $ 139 $ 592