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Lease Commitments - Components of Lease Expense (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Operating lease cost $ 31,963
Less: amounts capitalized (3,913)
Total operating lease expense 28,050
Financing lease cost:  
Amortization of right-of-use assets 973
Interest on lease liabilities 194
Less: amounts capitalized (704)
Total financing lease expense 463
Variable lease expense 96
Short-term lease expense 414
Total lease expense for the period 29,023
Public Service Company of New Mexico  
Lessee, Lease, Description [Line Items]  
Operating lease cost 28,254
Less: amounts capitalized (1,319)
Total operating lease expense 26,935
Financing lease cost:  
Amortization of right-of-use assets 481
Interest on lease liabilities 92
Less: amounts capitalized (280)
Total financing lease expense 293
Variable lease expense 96
Short-term lease expense 346
Total lease expense for the period 27,670
Texas-New Mexico Power Company  
Lessee, Lease, Description [Line Items]  
Operating lease cost 3,341
Less: amounts capitalized (2,594)
Total operating lease expense 747
Financing lease cost:  
Amortization of right-of-use assets 466
Interest on lease liabilities 100
Less: amounts capitalized (423)
Total financing lease expense 143
Variable lease expense 0
Short-term lease expense 26
Total lease expense for the period $ 916