Derivative Instruments (Details) $ in Thousands		Dec. 31, 2015 USD ($) bbl	Dec. 31, 2014 USD ($) bbl
Footnote [Abstract]
Cash collateral		$ 800	$ 0
Derivatives not designated as hedging instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Assets		171	480
Liabilities		(45)	(61)
Less: Counterparty netting and cash collateral, Assets	[1]	(706)	61
Less: Counterparty netting and cash collateral, Liabilities	[1]	(45)	(61)
Total net fair value of derivative, Assets		877	419
Total net fair value of derivative, Liabilities		$ 0	$ 0
Footnote [Abstract]
Open derivative contracts (barrels) | bbl		171,000	142,000
Other long term assets | Derivatives not designated as hedging instrument [Member] | Interest rate derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Assets		$ 0	$ 24
Liabilities		0	0
Other current assets | Derivatives not designated as hedging instrument [Member] | OTC commodity swaps
Derivative Instruments, Gain (Loss) [Line Items]
Assets	[2]	171	456
Liabilities	[2]	$ (45)	$ (61)

[1] As of December 31, 2015, $0.8 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, 2014, no cash collateral was held by counterparty brokerage firms.

[2] As of December 31, 2015, we had open derivative contracts representing 171,000 barrels of refined petroleum products. As of December 31, 2014, we had 142,000 open derivative contracts.