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Lease Commitments - Components of Lease Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lease, Cost [Line Items]        
Operating lease cost: $ 7,385 $ 7,658 $ 14,814 $ 15,393
Amounts capitalized (763) (849) (1,548) (1,774)
Total operating lease expense 6,622 6,809 13,266 13,619
Financing lease cost:        
Amortization of right-of-use assets 1,262 741 2,430 1,294
Interest on lease liabilities 141 121 281 224
Amounts capitalized (1,048) (594) (2,041) (1,053)
Total financing lease expense 355 268 670 465
Variable lease expense 106 63 168 95
Short-term lease expense 147 75 280 161
Total lease expense for the period 7,230 7,215 14,384 14,340
PNM        
Lease, Cost [Line Items]        
Operating lease cost: 6,715 6,847 13,450 13,740
Amounts capitalized (220) (247) (446) (538)
Total operating lease expense 6,495 6,600 13,004 13,202
Financing lease cost:        
Amortization of right-of-use assets 604 341 1,136 588
Interest on lease liabilities 65 52 127 97
Amounts capitalized (417) (226) (783) (401)
Total financing lease expense 252 167 480 284
Variable lease expense 106 63 168 95
Short-term lease expense 125 75 249 160
Total lease expense for the period 6,978 6,905 13,901 13,741
TNMP        
Lease, Cost [Line Items]        
Operating lease cost: 633 746 1,286 1,521
Amounts capitalized (543) (602) (1,102) (1,237)
Total operating lease expense 90 144 184 284
Financing lease cost:        
Amortization of right-of-use assets 637 382 1,251 672
Interest on lease liabilities 76 68 152 124
Amounts capitalized (632) (369) (1,258) (653)
Total financing lease expense 81 81 145 143
Variable lease expense 0 0 0 0
Short-term lease expense 2 1 4 1
Total lease expense for the period $ 173 $ 226 $ 333 $ 428