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Other Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2019
Other Intangible Assets [Line Items]        
Accumulated amortization $ (18,236) $ (12,138)    
Intangible assets, gross 172,274 28,055    
Intangible assets, net 154,038 15,917    
Rights-of-way assets        
Other Intangible Assets [Line Items]        
Rights-of-way assets $ 15,828 $ 15,828    
Supply contract        
Other Intangible Assets [Line Items]        
Estimated useful life (years) 11 years 6 months 11 years 6 months    
Intangible assets, gross $ 12,227 $ 12,227    
Accumulated amortization (12,227) (12,138)    
Intangible assets, net 0 89    
Amortization expense $ 6,100 $ 1,100 $ 1,100  
Marketing contract        
Other Intangible Assets [Line Items]        
Estimated useful life (years) 20 years      
Intangible assets, gross $ 144,219      
Accumulated amortization (6,009)      
Intangible assets, net $ 138,210      
Scenario, Forecast | Supply contract        
Other Intangible Assets [Line Items]        
Estimated future amortization expense       $ 7,200