Derivative Instruments Balance Sheet Location (Details) $ in Thousands		Mar. 31, 2016 USD ($) bbl	Dec. 31, 2015 USD ($) bbl
Footnote [Abstract]
Cash collateral			$ 800
Negative cash balance		$ 200
Derivatives not designated as hedging instrument [Member]
Derivatives, Fair Value [Line Items]
Assets		74	171
Liabilities		(13)	(45)
Counterparty Netting and Cash Collateral, Assets	[1]	74	(706)
Counterparty Netting and Cash Collateral, Liabilities	[1]	155	(45)
Total net fair value of derivative, assets		0	877
Total net fair value of derivative, liabilities		$ (168)	$ 0
Footnote [Abstract]
Derivative open contracts (barrels) | bbl		76,000	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]	74	171
Liabilities	[2]	$ (13)	$ (45)

[1] As of March 31, 2016, we had a negative cash balance of $0.2 million netted with the net derivative positions of one of our counterparties. As of December 31, 2015, $0.8 million

[2] As of March 31, 2016 and December 31, 2015, we had open derivative contracts representing 76,000 barrels and 171,000 barrels, respectively, of refined petroleum products