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Derivative Instruments Balance Sheet Location (Details)
$ in Thousands
Jun. 30, 2016
USD ($)
bbl
Dec. 31, 2015
USD ($)
bbl
Footnote [Abstract]    
Cash collateral $ 100 $ 800
Derivatives not designated as hedging instrument [Member]    
Derivatives, Fair Value [Line Items]    
Assets 50 171
Liabilities (71) (45)
Counterparty Netting and Cash Collateral, Assets [1] 13 (706)
Counterparty Netting and Cash Collateral, Liabilities [1] (71) (45)
Total net fair value of derivative, assets 37 877
Total net fair value of derivative, liabilities $ 0 $ 0
Footnote [Abstract]    
Derivative open contracts (barrels) | bbl 123,000 171,000
Derivatives not designated as hedging instrument [Member] | Interest rate derivatives | Other long term assets    
Derivatives, Fair Value [Line Items]    
Assets $ 0 $ 0
Liabilities 0 0
Derivatives not designated as hedging instrument [Member] | OTC commodity swaps | Other current assets    
Derivatives, Fair Value [Line Items]    
Assets [2] 50 171
Liabilities [2] $ (71) $ (45)
[1] As of June 30, 2016, $0.1 million of cash collateral was held by counterparty brokerage firms and has been netted with the net derivative positions with each counterparty. As of December 31, 2015, $0.8 million of cash collateral was held by counterparty brokerage firms.
[2] As of June 30, 2016 and December 31, 2015, we had open derivative contracts representing 123,000 barrels and 171,000 barrels, respectively, of refined petroleum products.