Segment Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015 USD ($) mi bbl	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) operating_segments mi bbl	Sep. 30, 2014 USD ($)	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
Total revenues	$ 674,479	$ 915,719	$ 2,016,376	$ 2,750,666
Operating Income (Loss)	22,684	16,719	64,450	50,954
Nonoperating Income (Expense)	(6,188)	(334)	(16,365)	(981)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	16,496	16,385	48,085	49,973
Depreciation and amortization	4,983	4,292	14,458	12,898
Payments to Acquire Productive Assets	7,609	5,248	24,021	17,335
Assets	412,033	308,907	412,033	308,907	$ 378,273
Logistics Segment [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	17,160	14,609	43,636	40,404
Assets	171,188	148,800	171,188	148,800
Wholesale Segment [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	8,515	4,985	29,675	17,729
Assets	158,680	65,302	158,680	65,302
Corporate Segment [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)	(2,991)	(2,875)	(8,861)	(7,179)
Assets	82,165	94,805	82,165	94,805
Operating Segments [Member] \| Logistics Segment [Member]
Segment Reporting Information [Line Items]
Revenues: Third-party	787	686	2,089	2,044
Revenues: Affiliate	40,478	34,914	110,129	101,294
Total revenues	41,265	35,600	112,218	103,338
Depreciation and amortization	3,837	3,331	11,128	10,042
Payments to Acquire Productive Assets	6,751	2,748	19,117	11,425
Operating Segments [Member] \| Wholesale Segment [Member]
Segment Reporting Information [Line Items]
Revenues: Third-party	462,924	635,532	1,414,632	1,958,816
Revenues: Affiliate	170,290	244,587	489,526	688,512
Total revenues	633,214	880,119	1,904,158	2,647,328
Depreciation and amortization	1,146	961	3,330	2,856
Payments to Acquire Productive Assets	$ 858	$ 2,500	$ 4,904	$ 5,910
Crude Oil Storage Tanks [Member] \| Logistics Segment [Member]
Segment Reporting Information [Line Items]
Active Storage Capacity \| bbl	620,000		620,000
Storage Tanks [Member] \| Logistics Segment [Member]
Segment Reporting Information [Line Items]
Active Storage Capacity \| bbl	7,400,000		7,400,000

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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