Revenue Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue, Net	$ 661,609	$ 456,100
Crude Transportation [Member]
Revenue, Net	26,068	13,979
Crude Facilities [Member]
Revenue, Net	9,284	9,635
Crude Supply and Logistics [Member]
Revenue, Net	443,399	297,471
HFOTCO LLC [Member]
Revenue, Net	44,198	0
SemGas [Member]
Revenue, Net	52,237	57,752
SemCAMS [Member]
Revenue, Net	45,145	36,798
Corporate and Reconciling Items And Eliminations [Member]
Revenue, Net	41,278	40,465
Intersegment Eliminations [Member]
Revenue, Net	(14,859)	(12,971)
Intersegment Eliminations [Member] | Crude Transportation [Member]
Revenue, Net	8,208	6,554
Intersegment Eliminations [Member] | Crude Facilities [Member]
Revenue, Net	2,993	2,506
Intersegment Eliminations [Member] | SemGas [Member]
Revenue, Net	3,658	3,911
Pipeline transportation [Member] | Crude Transportation [Member]
Revenue, Net	21,112	6,184
Truck Transportation Revenue [Member] | Crude Transportation [Member]
Revenue, Net	13,164	14,349
Storage Services [Member] | Crude Facilities [Member]
Revenue, Net	7,549	7,881
Storage Services [Member] | HFOTCO LLC [Member]
Revenue, Net	32,102	0
Storage Services [Member] | Corporate and Reconciling Items And Eliminations [Member]
Revenue, Net	7,104	5,870
Service Fees [Member] | Crude Facilities [Member]
Revenue, Net	4,728	4,260
Service Fees [Member] | HFOTCO LLC [Member]
Revenue, Net	7,767	0
Service Fees [Member] | SemGas [Member]
Revenue, Net	16,187	14,436
Service Fees [Member] | SemCAMS [Member]
Revenue, Net	30,542	22,393
Service Fees [Member] | Corporate and Reconciling Items And Eliminations [Member]
Revenue, Net	2,855	2,022
Other revenue [Member] | SemCAMS [Member]
Revenue, Net	14,603	14,405
Lease revenue [Member] | HFOTCO LLC [Member]
Revenue, Net	4,329	0
Product Sales [Member] | Crude Supply and Logistics [Member]
Revenue, Net	443,399	297,471
Product Sales [Member] | SemGas [Member]
Revenue, Net	39,708	47,227
Product Sales [Member] | Corporate and Reconciling Items And Eliminations [Member]
Revenue, Net	$ 31,319	$ 32,573