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Lease Commitments - Schedule of Supplemental Cash Flows Related to Leases (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities: |  |
Operating cash flows from operating leases | $ 16,572 | $ 17,125
Operating cash flows from financing leases | 63 | 59
Finance cash flows from financing leases | 592 | 360
Non-cash information related to right-of-use assets obtained in exchange for lease obligations: |  |
Operating leases | 317 | 0
Financing leases | 2,793 | 8,513
PNM |  |
Cash paid for amounts included in the measurement of lease liabilities: |  |
Operating cash flows from operating leases | 16,291 | 16,511
Operating cash flows from financing leases | 43 | 36
Finance cash flows from financing leases | 392 | 207
Non-cash information related to right-of-use assets obtained in exchange for lease obligations: |  |
Operating leases | 0 | 0
Financing leases | 1,512 | 3,703
TNMP |  |
Cash paid for amounts included in the measurement of lease liabilities: |  |
Operating cash flows from operating leases | 188 | 331
Operating cash flows from financing leases | 17 | 20
Finance cash flows from financing leases | 156 | 120
Non-cash information related to right-of-use assets obtained in exchange for lease obligations: |  |
Operating leases | 317 | 0
Financing leases | $ 1,254 | $ 4,802

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