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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 |

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