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Commitments and Contingencies - Right-of-Way, Complaints, and Navajo National Allottee Matters (Details)
$ in Millions
 3 Months Ended
Jan. 04, 2016
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Oct. 31, 2018
USD ($)
Nov. 20, 2017
Allotment_Parcel
Dec. 01, 2015
Allotment_Parcel
Jul. 13, 2015
a
Jan. 22, 2015
Allotment_Parcel
Apr. 02, 2014
landowner
Allotment_Parcel
Feb. 27, 2014
lawsuit
Sep. 30, 2012
landowner
First Choice                      
Loss Contingencies [Line Items]                      
Additional tax due plus penalties and interest | $   $ 5.0                  
Navajo Nation Allottee Matters | Public Service Company of New Mexico                      
Loss Contingencies [Line Items]                      
Number of landowners claiming to be Navajo allottees (in landowners) | landowner                 43   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 2          
Number of allotment parcels at issue           5          
Pending Litigation                      
Loss Contingencies [Line Items]                      
Number of claims (in lawsuits) | lawsuit                   2  
Written notification requirement to terminate agreement, minimum period 30 days                    
Settled Litigation                      
Loss Contingencies [Line Items]                      
Number of claims (in lawsuits) | lawsuit                   1  
State and Local Jurisdiction | First Choice                      
Loss Contingencies [Line Items]                      
Sales and use tax audit | $     $ 1.4 $ 0.9