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Prepaid and Other Current Assets
9 Months Ended
Sep. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaid and Other Current Assets
Prepaid and Other Current Assets
Prepaid and other current assets at September 30, 2017 and December 31, 2016 consisted of the following (in thousands):
 
September 30, 2017
 
December 31, 2016
Advances to suppliers for crude oil purchases
$

 
$
38,300

Collateral posted with broker for derivative instruments
708

 
2,714

Prepaid insurance

 
7,504

Derivative assets
2,413

 
161

Other
5,818

 
4,701

Total
$
8,939

 
$
53,380