Segment Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)
Segment Reporting [Abstract]
Reporting segments | segment	4
Segment Reporting Information [Line Items]
Revenues	$ 765,439	$ 605,253
Cost of revenues (excluding depreciation)	661,899	501,289
Operating expense (excluding depreciation)	51,010	50,348
Depreciation, depletion, and amortization	13,037	11,260
General and administrative expense (excluding depreciation)	11,205	12,914
Acquisition and integration expense	632	253
Operating income	27,656	29,189
Interest expense and financing costs, net	(8,377)	(8,942)
Other income, net	119	130
Change in value of common stock warrants	745	(689)
Change in value of contingent consideration	(10,500)	0
Equity earnings from Laramie Energy, LLC	5,576	8,746
Income before income taxes	15,219	28,434
Income tax expense	(34)	(648)
Net income	15,185	27,786
Capital expenditures	9,612	7,579
Operating Segments | Refining
Segment Reporting Information [Line Items]
Revenues	740,263	574,079
Cost of revenues (excluding depreciation)	668,479	503,044
Operating expense (excluding depreciation)	37,349	36,216
Depreciation, depletion, and amortization	8,362	7,403
General and administrative expense (excluding depreciation)	0	0
Acquisition and integration expense	0	0
Operating income	26,073	27,416
Capital expenditures	4,974	1,009
Operating Segments | Logistics
Segment Reporting Information [Line Items]
Revenues	33,067	29,995
Cost of revenues (excluding depreciation)	20,810	15,298
Operating expense (excluding depreciation)	1,822	3,797
Depreciation, depletion, and amortization	1,642	1,487
General and administrative expense (excluding depreciation)	0	0
Acquisition and integration expense	0	0
Operating income	8,793	9,413
Capital expenditures	2,683	1,197
Operating Segments | Retail
Segment Reporting Information [Line Items]
Revenues	78,592	77,682
Cost of revenues (excluding depreciation)	59,147	59,799
Operating expense (excluding depreciation)	11,839	10,315
Depreciation, depletion, and amortization	1,868	1,448
General and administrative expense (excluding depreciation)	0	0
Acquisition and integration expense	0	0
Operating income	5,738	6,120
Capital expenditures	701	3,497
Corporate, Eliminations and Other
Segment Reporting Information [Line Items]
Revenues	(86,483)	(76,503)
Cost of revenues (excluding depreciation)	(86,537)	(76,852)
Operating expense (excluding depreciation)	0	20
Depreciation, depletion, and amortization	1,165	922
General and administrative expense (excluding depreciation)	11,205	12,914
Acquisition and integration expense	632	253
Operating income	(12,948)	(13,760)
Capital expenditures	1,254	1,876
Gross profit	$ 85,900	$ 77,200