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Prepaid and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Advances to suppliers for crude oil purchases $ 33,626 $ 36,247
Collateral posted with broker for derivative instruments 5,944 20,926
Prepaid insurance 13 6,773
Derivative assets 0 4,577
Other 3,577 6,914
Total $ 43,160 $ 75,437