Segment Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($) mi bbl	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) mi operating_segments bbl	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Total revenues	$ 606,816	$ 569,261	$ 578,602	$ 468,039	$ 575,897	$ 680,670	$ 735,904	$ 607,396	$ 2,222,718	$ 2,599,867	$ 3,501,888
Operating Income (Loss)	27,039	$ 13,271	$ 16,597	$ 13,188	14,340	$ 18,424	$ 13,498	$ 9,532	70,095	55,794	35,607
Other income, net									(26,042)	(23,041)	(2,240)
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest									44,053	32,753	33,367
Depreciation and amortization									39,242	35,384	28,934
Payments to Acquire Productive Assets									30,308	67,625	79,338
Assets	$ 580,854				610,222				$ 580,854	610,222	602,564
Number of Reportable Segments | operating_segments									2
Pipeline, Miles | mi	705								705
Active Storage Capacity | bbl	12,400,000								12,400,000
Gain (Loss) on Sale of Assets and Asset Impairment Charges									$ 1,054	278	(157)
Wholesale Segment [Member]
Segment Reporting Information [Line Items]
Severance Costs									400
Gain (Loss) on Sale of Assets and Asset Impairment Charges									$ 600
Crude Oil Storage Tanks [Member] | Logistics Segment [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Operated, Number of Significant Assets | mi	33								33
Active Storage Capacity | bbl	959,000								959,000
Truck Loading and Unloading Locations [Member] | Logistics Segment [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Operated, Number of Significant Assets | mi	8								8
Pump Station [Member] | Logistics Segment [Member]
Segment Reporting Information [Line Items]
Property, Plant and Equipment, Operated, Number of Significant Assets | mi	15								15
Storage Tanks [Member] | Logistics Segment [Member]
Segment Reporting Information [Line Items]
Active Storage Capacity | bbl	11,400,000								11,400,000
Operating Segments [Member]
Segment Reporting Information [Line Items]
Depreciation and amortization									$ 39,242	35,384	28,934
Payments to Acquire Productive Assets									30,308	67,625	79,338
Operating Segments [Member] | Wholesale Segment [Member]
Segment Reporting Information [Line Items]
Revenues: Affiliate									523,557	624,787	873,589
Revenues: Third-party									1,517,650	1,810,773	2,487,595
Total revenues									2,041,207	2,435,560	3,361,184
Operating Income (Loss)									39,384	38,159	28,234
Depreciation and amortization									5,532	4,486	3,893
Payments to Acquire Productive Assets									2,414	6,421	7,868
Assets	$ 151,669				147,597				151,669	147,597	160,158
Operating Segments [Member] | Logistics Segment [Member]
Segment Reporting Information [Line Items]
Revenues: Affiliate									178,600	161,536	137,986
Revenues: Third-party									2,911	2,771	2,718
Total revenues									181,511	164,307	140,704
Operating Income (Loss)									43,863	30,880	19,332
Depreciation and amortization									33,710	30,898	25,041
Payments to Acquire Productive Assets									27,894	61,204	71,470
Assets	412,551				413,847				412,551	413,847	385,918
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Operating Income (Loss)									(13,152)	(13,245)	(11,959)
Assets	16,634				$ 48,778				16,634	$ 48,778	$ 56,488
Inventories [Member]
Segment Reporting Information [Line Items]
Assets Held-for-sale, Not Part of Disposal Group	10,100								10,100
Property, Plant and Equipment [Member]
Segment Reporting Information [Line Items]
Assets Held-for-sale, Not Part of Disposal Group	$ 7,300								$ 7,300