Crude Oil Supply and Inventory Purchase Agreement (Details) bbl in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) bbl / pure bbl	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Maximum Barrels Per Day Supplied under Supply and Offtake Agreement (bpd)	100,000
J Aron Daily Purchase Settlement Receivable	$ 1.0		$ 6.9
Barrels of Inventory Consigned to J Aron | bbl	2.5
J Aron Liability for Consigned Inventory	$ 130.2
Interest Expense [Member]
Inventory financing expense	$ 2.5	$ 2.5