Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)
Segment Reporting [Abstract]
Reporting segments | segment			4
Segment Reporting Information [Line Items]
Revenues	$ 856,396	$ 564,245	$ 1,621,835	$ 1,169,498
Cost of revenues (excluding depreciation)	747,924	474,353	1,409,823	975,642
Operating expense (excluding depreciation)	53,060	51,675	104,070	102,023
Depreciation, depletion, and amortization	12,775	11,284	25,812	22,544
General and administrative expense (excluding depreciation)	12,905	10,482	24,110	23,396
Acquisition and integration expense	749	0	1,381	253
Operating income	28,983	16,451	56,639	45,640
Interest expense and financing costs, net	(10,544)	(9,139)	(18,921)	(18,081)
Loss on termination of financing agreements	0	(1,804)	0	(1,804)
Other income, net	657	107	776	237
Change in value of common stock warrants	(74)	(547)	671	(1,236)
Change in value of contingent consideration	0	0	(10,500)	0
Equity earnings (losses) from Laramie Energy, LLC	(2,352)	2,352	3,224	11,098
Income before income taxes	16,670	7,420	31,889	35,854
Income tax expense	(492)	(414)	(526)	(1,062)
Net income	16,178	7,006	31,363	34,792
Capital expenditures	8,045	4,198	17,657	11,777
Refining
Segment Reporting Information [Line Items]
Revenues	800,408		1,540,671
Logistics
Segment Reporting Information [Line Items]
Revenues	31,289		64,356
Retail
Segment Reporting Information [Line Items]
Revenues	119,691		198,283
Operating Segments | Refining
Segment Reporting Information [Line Items]
Revenues	800,408	532,751	1,540,671	1,106,830
Cost of revenues (excluding depreciation)	731,104	476,764	1,399,583	979,808
Operating expense (excluding depreciation)	34,747	34,895	72,096	71,111
Depreciation, depletion, and amortization	7,475	7,450	15,837	14,853
General and administrative expense (excluding depreciation)	0	0	0	0
Acquisition and integration expense	0		0	0
Operating income	27,082	13,642	53,155	41,058
Capital expenditures	5,053	1,315	10,027	2,324
Operating Segments | Logistics
Segment Reporting Information [Line Items]
Revenues	31,289	29,623	64,356	59,618
Cost of revenues (excluding depreciation)	18,581	15,827	39,391	31,125
Operating expense (excluding depreciation)	2,385	4,849	4,207	8,646
Depreciation, depletion, and amortization	1,673	1,524	3,315	3,011
General and administrative expense (excluding depreciation)	0	0	0	0
Acquisition and integration expense	0		0	0
Operating income	8,650	7,423	17,443	16,836
Capital expenditures	1,866	1,542	4,549	2,739
Operating Segments | Retail
Segment Reporting Information [Line Items]
Revenues	119,691	82,347	198,283	160,029
Cost of revenues (excluding depreciation)	93,213	61,942	152,360	121,741
Operating expense (excluding depreciation)	15,924	11,951	27,763	22,266
Depreciation, depletion, and amortization	2,697	1,458	4,565	2,906
General and administrative expense (excluding depreciation)	0	0	0	0
Acquisition and integration expense	0		0	0
Operating income	7,857	6,996	13,595	13,116
Capital expenditures	394	126	1,095	3,623
Intersegment Eliminations
Segment Reporting Information [Line Items]
Revenues	(94,992)	(80,476)	(181,475)	(156,979)
Cost of revenues (excluding depreciation)	(94,974)	(80,180)	(181,511)	(157,032)
Operating expense (excluding depreciation)	4	(20)	4	0
Depreciation, depletion, and amortization	930	852	2,095	1,774
General and administrative expense (excluding depreciation)	12,905	10,482	24,110	23,396
Acquisition and integration expense	749		1,381	253
Operating income	(14,606)	(11,610)	(27,554)	(25,370)
Capital expenditures	732	1,215	1,986	3,091
Gross profit	$ (95,000)	$ (80,900)	$ (180,900)	$ (158,100)