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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2016
Derivative Instruments [Abstract]  
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
The following table presents the fair value of our derivative instruments, as of June 30, 2016 and December 31, 2015. The fair value amounts below are presented on a gross basis and do not reflect the netting of asset and liability positions permitted under our master netting arrangements, including any cash collateral on deposit with our counterparties. We have elected to offset the recognized fair value amounts for multiple derivative instruments executed with the same counterparty in our financial statements. As a result, the asset and liability amounts below may differ from the amounts presented in our consolidated balance sheets. During the three and six months ended June 30, 2016 and June 30, 2015, we did not elect hedge accounting treatment for these derivative positions. As a result, all changes in fair value are marked to market in the accompanying condensed consolidated statements of income and comprehensive income.

(in thousands)
 
 
June 30, 2016
 
December 31, 2015
Derivative Type
Balance Sheet Location
 
Assets
 
Liabilities
 
Assets
 
Liabilities
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
 
 
Interest rate derivatives
Other long term assets
 
$
—

 
$
—

 
$
—

 
$
—

OTC commodity swaps (1)
Other current assets
 
50

 
(71
)
 
171

 
(45
)
Total gross value of derivatives
 
50

 
(71
)
 
171

 
(45
)
Less: Counterparty netting and cash collateral (2)
 
13

 
(71
)
 
(706
)
 
(45
)
Total net fair value of derivatives
 
$
37

 
$
—

 
$
877

 
$
—

            

(1) 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.

(2) 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.
Derivative Instruments, Gain (Loss) [Table Text Block]
Recognized gains (losses) associated with derivatives not designated as hedging instruments for the three and six months ended June 30, 2016 and 2015 were as follows (in thousands):
 
 
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
Derivative Type
Income Statement Location
 
2016
 
2015
 
2016
 
2015
Interest rate derivatives
Interest expense
 
$
—

 
$
(4
)
 
$
—

 
$
(23
)
Commodity derivatives
Cost of goods sold
 
(1,282
)
 
(157
)
 
(1,459
)
 
182

 
Total
 
$
(1,282
)
 
$
(161
)
 
$
(1,459
)
 
$
159