Quarterly report pursuant to Section 13 or 15(d)

Transportation and Distribution Revenue - Additional Information (Details)

v3.20.1
Transportation and Distribution Revenue - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 143 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Oct. 31, 2030
Dec. 31, 2019
Concentration Risk [Line Items]        
Remaining performance obligation $ 56,800      
Contract asset balance $ 45     $ 206
Natural gas transportation contracts | Product and services | Revenue        
Concentration Risk [Line Items]        
Concentration percentage 68.80% 61.40%    
Natural gas distribution contracts | Product and services | Revenue        
Concentration Risk [Line Items]        
Concentration percentage 23.20% 34.80%    
Forecast        
Concentration Risk [Line Items]        
Recognized performance obligations quarterly     $ 138