Segment Data (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Information For Our Reportable Segments
Net sales to external customers	[1]	$ 1,008,388	$ 1,301,341	$ 1,858,361	$ 2,404,581
Intersegment sales (purchases)		0	0	0	0
Depreciation and amortization		36,985	31,267	71,847	63,229
Operating income (loss)		(14,811)	88,094	(54,250)	155,655
Turnarounds, catalysts and capital expenditures		21,446	22,332	61,502	35,414
Total Assets By Reportable Segment
Total assets		2,245,464		2,245,464		$ 2,176,138
Refining and Marketing
Segment Information For Our Reportable Segments
Net sales to external customers		753,029	1,024,807	1,386,532	1,901,410
Intersegment sales (purchases)		76,884	101,233	139,994	184,122
Depreciation and amortization		31,514	26,692	61,298	54,003
Operating income (loss)		(23,759)	83,581	(66,122)	159,228
Turnarounds, catalysts and capital expenditures		19,222	14,500	54,391	21,239
Total Assets By Reportable Segment
Total assets		1,869,095		1,869,095		1,822,924
Asphalt
Segment Information For Our Reportable Segments
Net sales to external customers		68,097	69,900	121,596	120,552
Intersegment sales (purchases)		(3,237)	(7,925)	(8,685)	(18,856)
Depreciation and amortization		1,261	1,207	2,521	2,352
Operating income (loss)		5,194	(1,723)	4,546	(16,154)
Turnarounds, catalysts and capital expenditures		335	238	1,075	1,644
Total Assets By Reportable Segment
Total assets		118,940		118,940		106,015
Retail
Segment Information For Our Reportable Segments
Net sales to external customers		187,262	206,634	350,233	382,619
Intersegment sales (purchases)		(73,647)	(93,308)	(131,309)	(165,266)
Depreciation and amortization		3,350	2,943	6,749	5,980
Operating income (loss)		4,797	6,837	8,979	13,827
Turnarounds, catalysts and capital expenditures		1,200	6,202	3,911	9,518
Total Assets By Reportable Segment
Total assets		237,630		237,630		231,078
Corporate
Segment Information For Our Reportable Segments
Net sales to external customers		0	0	0	0
Intersegment sales (purchases)		0	0	0	0
Depreciation and amortization		860	425	1,279	894
Operating income (loss)		(1,043)	(601)	(1,653)	(1,246)
Turnarounds, catalysts and capital expenditures		689	$ 1,392	2,125	$ 3,013
Total Assets By Reportable Segment
Total assets		$ 19,799		$ 19,799		$ 16,121

[1] Includes excise taxes on sales by the retail segment of $19,864 and $19,369 for the three months and $39,389 and $37,425 for the six months ended June 30, 2016 and 2015, respectively.