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Lease Commitments - Schedule of Future Expected Lease Payments (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Financing
2021	$ 4,970
2022	4,797
2023	4,511
2024	3,335
2025	2,044
Later years	2,150
Total minimum lease payments	21,807
Less: Imputed interest	1,365
Lease liabilities as of December 31, 2020	20,442
Operating
2021	29,290
2022	28,464
2023	19,395
2024	8,841
2025	7,673
Later years	27,827
Total minimum lease payments	121,490
Less: Imputed interest	12,965
Lease liabilities as of December 31, 2020	108,525
Public Service Company of New Mexico
Financing
2021	2,214
2022	2,159
2023	2,095
2024	1,434
2025	854
Later years	1,030
Total minimum lease payments	9,786
Less: Imputed interest	617
Lease liabilities as of December 31, 2020	9,169
Operating
2021	26,572
2022	26,266
2023	17,735
2024	7,899
2025	6,946
Later years	27,530
Total minimum lease payments	112,948
Less: Imputed interest	11,877
Lease liabilities as of December 31, 2020	101,071
Texas-New Mexico Power Company
Financing
2021	2,672
2022	2,557
2023	2,372
2024	1,897
2025	1,190
Later years	1,120
Total minimum lease payments	11,808
Less: Imputed interest	742
Lease liabilities as of December 31, 2020	11,066
Operating
2021	2,426
2022	1,987
2023	1,481
2024	895
2025	690
Later years	75
Total minimum lease payments	7,554
Less: Imputed interest	582
Lease liabilities as of December 31, 2020	$ 6,972

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