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Commitments and Contingencies - Right-of-Way, Complaints, and Navajo National Allottee Matters (Details) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2012 landowner | Dec. 31, 2019 Allotment_Parcel | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 01, 2015 Allotment_Parcel | Jul. 13, 2015 a | Jan. 22, 2015 Allotment_Parcel
First Choice |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Tax settlement | $ |  |  | $ 2.3 |  |  |  |
Navajo Nation Allottee Matters | Public Service Company of New Mexico |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Number of landowners involved in the appeal | landowner | 43 |  |  |  |  |  |
Number of allotments where landowners are revoking rights of way renewal consents (in allotment parcels) |  | 6 |  |  |  |  |
Allotments with right-of-way renewals not previously contested (in allotment parcels) |  |  |  |  |  |  | 10
Acres of land at issue (in acres) | a |  |  |  |  |  | 15.49 |
Number of allotment parcels that cannot be condemned |  |  |  |  | 2 |  |
Number of allotment parcels at issue |  |  |  |  | 5 |  |
Pending Litigation |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Written notification requirement to terminate agreement, minimum period |  | 30 days |  |  |  |  |
Taxes Other Than Income Taxes | First Choice |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Tax settlement | $ |  |  | $ 1.4 | $ 0.2 |  |  |

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