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Lease Commitments - Future Minimum Rental Payments for Operating Leases (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
PNMR  
Lease commitments  
2018 $ 26,802
2019 25,638
2020 25,208
2021 25,122
2022 25,122
Later years 60,708
Total minimum lease payments 188,600
Public Service Company of New Mexico  
Lease commitments  
2018 25,726
2019 25,241
2020 25,122
2021 25,122
2022 25,122
Later years 60,708
Total minimum lease payments 187,041
Texas-New Mexico Power Company  
Lease commitments  
2018 791
2019 296
2020 0
2021 0
2022 0
Later years 0
Total minimum lease payments $ 1,087