Inventories (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Inventories
Crude Oil	$ 551,484		$ 551,484		$ 581,417
Other raw materials and unfinished products	385,242		385,242		396,618
Finished products	636,679		636,679		655,336
Lower of cost or market reserve	(13,069)		(13,069)		(223,833)
Process chemicals	28,649		28,649		24,792
Repair and maintenance supplies and other	227,887		227,887		195,762
Inventories, total	1,816,872		1,816,872		$ 1,630,092
Lower of cost or market inventory valuation adjustment	$ (106,926)	$ 83,982	$ (210,764)	$ 95,805