Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) terminals mi bbl	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) terminals operating_segments mi bbl	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Segment Reporting, Number of Business Segments | operating_segments			2
Pipeline, Miles | mi	300		300
Active Storage Capacity | bbl	8,100,000		8,100,000
Revenue, Net	$ 734,501	$ 970,337	$ 1,341,897	$ 1,834,947
Operating Income (Loss)	22,293	17,474	41,766	34,235
Nonoperating Income (Expense)	(6,230)	(329)	(10,177)	(647)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	16,063	17,145	31,589	33,588
Net income	15,915	17,060	31,238	33,384
Depreciation and amortization	4,737	4,454	9,475	8,606
Payments to Acquire Productive Assets	7,850	3,708	16,412	12,087
Assets	441,617	308,537	441,617	308,537	$ 378,273
Operating Segments [Member] | Logistics Segment [Member]
Segment Reporting Information [Line Items]
Revenues: Third-party	679	657	1,302	1,358
Revenues: Affiliate	34,876	34,324	69,651	66,380
Revenue, Net	35,555	34,981	70,953	67,738
Operating Income (Loss)	13,236	12,944	26,476	25,795
Depreciation and amortization	3,630	3,467	7,291	6,711
Payments to Acquire Productive Assets	6,851	2,773	12,366	8,677
Assets	167,210	149,122	167,210	149,122
Operating Segments [Member] | Wholesale Segment [Member]
Segment Reporting Information [Line Items]
Revenues: Third-party	523,184	695,959	951,708	1,323,284
Revenues: Affiliate	175,762	239,397	319,236	443,925
Revenue, Net	698,946	935,356	1,270,944	1,767,209
Operating Income (Loss)	12,171	6,625	21,160	12,744
Depreciation and amortization	1,107	987	2,184	1,895
Payments to Acquire Productive Assets	999	935	4,046	3,410
Assets	185,523	63,808	185,523	63,808
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(3,114)	(2,095)	(5,870)	(4,304)
Assets	$ 88,884	$ 95,607	$ 88,884	$ 95,607
Crude Oil Storage Tanks [Member] | Logistics Segment [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Operated, Number of Significant Assets | terminals	29		29
Active Storage Capacity | bbl	620,000		620,000
Truck Loading and Unloading Locations [Member] | Logistics Segment [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Operated, Number of Significant Assets	8		8
Pump Station [Member] | Logistics Segment [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Operated, Number of Significant Assets	14		14
Storage Tanks [Member] | Logistics Segment [Member]
Segment Reporting Information [Line Items]
Active Storage Capacity | bbl	7,400,000		7,400,000