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Inventory - Schedule of Inventory (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Inventory    
Crude oil inventory $ 8,400 $ 18,296
Equipment and materials 28,520 16,963
Total inventory 36,920 35,259
Long-term inventory    
Linefill in third party pipelines 14,173 13,924
Total long-term inventory 14,173 13,924
Total $ 51,093 $ 49,183