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Lease Commitments - Future Minimum Rental Payments for Operating Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Lease commitments  
2019 $ 31,772
2020 30,404
2021 29,012
2022 28,175
2023 18,868
Later years 43,489
Total minimum lease payments 181,720
Public Service Company of New Mexico  
Lease commitments  
2019 27,691
2020 27,000
2021 26,462
2022 26,217
2023 17,447
Later years 42,329
Total minimum lease payments 167,146
Texas-New Mexico Power Company  
Lease commitments  
2019 3,664
2020 3,102
2021 2,324
2022 1,795
2023 1,279
Later years 1,150
Total minimum lease payments $ 13,314