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Other Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Summary of prepaid expense and other assets    
Commodity derivatives and related collateral, net $ 8,724 $ 7,127
Prepaid expenses 11,679 10,665
Deposits 2,900 2,897
RIN inventory 18,481 9,398
Taxes receivable 6,925 4,539
Other 1,330 1,646
Total $ 50,039 $ 36,272