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Inventories (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Inventory [Line Items]    
Crude oil and feedstocks $ 82,860,000 $ 149,984,000
Refined products and blendstock 217,053,000 172,422,000
Warehouse stock and other 33,780,000 22,951,000
Total 333,693,000 345,357,000
Reserves for the lower of cost or market value of inventory 0 0
Titled Inventory    
Inventory [Line Items]    
Crude oil and feedstocks 10,139,000 93,970,000
Refined products and blendstock 78,054,000 63,505,000
Warehouse stock and other 33,780,000 22,951,000
Total 121,973,000 180,426,000
Supply and Offtake Agreements    
Inventory [Line Items]    
Crude oil and feedstocks 72,721,000 56,014,000
Refined products and blendstock 138,999,000 108,917,000
Warehouse stock and other 0 0
Total 211,720,000 $ 164,931,000
Renewable Identification Numbers “RINs”    
Inventory [Line Items]    
Warehouse stock and other $ 7,300,000