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Prepaid and Other Current Assets
6 Months Ended
Jun. 30, 2018
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 June 30, 2018 and December 31, 2017 consisted of the following (in thousands):
 
June 30, 2018
 
December 31, 2017
Advances to suppliers for crude oil purchases
$
70,387

 
$

Collateral posted with broker for derivative instruments
2,593

 
215

Prepaid insurance
2,858

 
7,547

Derivative assets
3,217

 
4,296

Other
7,886

 
5,221

Total
$
86,941

 
$
17,279