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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory [Line Items]    
Crude oil and feedstocks $ 313,112 $ 124,877
Refined products and blendstock 297,422 162,576
Warehouse stock and other 61,209 34,612
Total 671,743 322,065
Reserves for the lower of cost or market value of inventory 6,200 3,800
LIFO reserve 10,300  
Titled Inventory    
Inventory [Line Items]    
Crude oil and feedstocks 192,807 7,000
Refined products and blendstock 132,795 62,401
Warehouse stock and other 61,209 34,612
Total 386,811 104,013
Supply and Offtake Agreements    
Inventory [Line Items]    
Crude oil and feedstocks 120,305 117,877
Refined products and blendstock 164,627 100,175
Warehouse stock and other 0 0
Total 284,932 218,052
Renewable Identification Numbers “RINs”    
Inventory [Line Items]    
Warehouse stock and other $ 17,100 $ 5,000