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Inventories (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Inventory [Line Items] |  |
Crude oil and feedstocks | $ 143,552 | $ 61,302
Refined products and blendstock | 142,677 | 116,593
Warehouse stock and other | 20,973 | 20,431
Total | 307,202 | 198,326
Reserves for the lower of cost or market value of inventory | 8,600 | 200
Titled Inventory |  |
Inventory [Line Items] |  |
Crude oil and feedstocks | 59,430 | 11,620
Refined products and blendstock | 39,299 | 38,916
Warehouse stock and other | 20,973 | 20,431
Total | 119,702 | 70,967
Supply and Offtake Agreements |  |
Inventory [Line Items] |  |
Crude oil and feedstocks | 84,122 | 49,682
Refined products and blendstock | 103,378 | 77,677
Warehouse stock and other | 0 | 0
Total | $ 187,500 | $ 127,359

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