Other Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Summary of prepaid expense and other assets
Commodity derivatives and related collateral, net	$ 4,674	$ 1,610
Prepaid expenses	21,414	11,733
Deposits	1,915	2,899
RIN inventory	10,195	27,028
Taxes receivable	5,103	6,356
Other	1,993	2,254
Total	$ 45,294	$ 51,880