Inventories (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Inventory [Line Items]
Crude oil and feedstocks	$ 197,906,000	$ 124,877,000
Refined products and blendstock	254,154,000	162,576,000
Warehouse stock and other	47,459,000	34,612,000
Total	499,519,000	322,065,000
Reserves for the lower of cost or market value of inventory	0	3,800,000
LIFO reserve	8,100,000
Titled Inventory
Inventory [Line Items]
Crude oil and feedstocks	83,849,000	7,000,000
Refined products and blendstock	113,471,000	62,401,000
Warehouse stock and other	47,459,000	34,612,000
Total	244,779,000	104,013,000
Supply and Offtake Agreements
Inventory [Line Items]
Crude oil and feedstocks	114,057,000	117,877,000
Refined products and blendstock	140,683,000	100,175,000
Warehouse stock and other	0	0
Total	254,740,000	218,052,000
Renewable Identification Numbers “RINs”
Inventory [Line Items]
Warehouse stock and other	$ 3,800,000	$ 5,000,000