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INVENTORIES (Details)
$ in Thousands, gal in Millions
Dec. 31, 2018
USD ($)
gal
Dec. 31, 2017
USD ($)
gal
Inventory Disclosure [Abstract]    
Liquid petroleum products $ 186,683 $ 280,934
Materials and supplies 24,201 20,491
Total inventories $ 210,884 $ 301,425
Refined petroleum products (in gallons) | gal 114.7 142.1
Percentage of hedged refined petroleum products inventory 94.00% 85.00%