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Derivative Instruments (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 and December 31, 2016. 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 accompanying consolidated balance sheets. During the three and six months ended June 30, 2017 and 2016, 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. See Note 11 for further information regarding the fair value of derivative instruments.

(in thousands)
 
 
 
June 30, 2017
 
December 31, 2016
Derivative Type
 
Balance Sheet Location
 
Assets
 
Liabilities
 
Assets
 
Liabilities
Derivatives:
 
 
 
 
 
 
 
 
OTC commodity swaps (1)
 
Other current assets
 
$
11

 
$
(257
)
 
$
9

 
$
(82
)
Total gross value of derivatives
 
11

 
(257
)
 
9

 
(82
)
Less: Counterparty netting and cash collateral (2)
 
(591
)
 
(257
)
 
9

 
621

Total net fair value of derivatives
 
$
602

 
$
—

 
$
—

 
$
(703
)
            

(1) As of June 30, 2017 and December 31, 2016, we had open derivative contracts representing 91,000 barrels and 93,000 barrels, respectively, of refined petroleum products.

(2) As of June 30, 2017, $0.8 million of cash collateral was held by a counterparty brokerage firm and has been netted with the net derivative position of our counterparty. As of December 31, 2016, we had a cash deficit of $0.6 million netted with the net derivative position of our counterparty.
Derivative Instruments, Gain (Loss) [Table Text Block]
Recognized gains (losses) associated with our derivatives for the three and six months ended June 30, 2017 and 2016 were as follows (in thousands):
 
 
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
Derivative Type
Income Statement Location
 
2017
 
2016
 
2017
 
2016
Commodity derivatives
Cost of goods sold
 
$
606

 
$
(1,282
)
 
$
1,116

 
$
(1,459
)