Annual report pursuant to Section 13 and 15(d)

Leased Properties and Leases - Significant Leases (Details)

v3.10.0.1
Leased Properties and Leases - Significant Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pinedale LGS      
Operating Leased Assets [Line Items]      
Percentage of total leased properties 44.50% 39.90%  
Percentage of leased property revenue 35.20% 31.20% 30.40%
Variable rent $ 4,300 $ 587  
Grand Isle Gathering System      
Operating Leased Assets [Line Items]      
Percentage of total leased properties 55.20% 49.70%  
Percentage of leased property revenue 55.90% 59.10% 59.80%
Portland Terminal Facility      
Operating Leased Assets [Line Items]      
Percentage of total leased properties 0.00% 10.10%  
Percentage of leased property revenue 8.80% 9.60% 9.70%