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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