v3.8.0.1
SEGMENT INFORMATION Table 1 - Results of Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenues:    
Revenues $ 475,881 $ 487,430
Operating income:    
General and administrative expenses 19,774 24,595
Other depreciation and amortization expense 2,118 2,193
Operating income (loss) 98,480 97,139
Pipeline Segment    
Revenues:    
Revenues 136,790 121,240
Storage Segment    
Revenues:    
Revenues 155,328 147,431
Storage Segment | Third Party Revenue [Member]    
Revenues:    
Revenues 153,253 143,488
Storage Segment | Intersegment Revenue [Member]    
Revenues:    
Revenues 2,075 3,943
Fuels Marketing Segment    
Revenues:    
Revenues 185,838 222,702
Operating Segments [Member]    
Operating income:    
Operating income (loss) 120,372 123,927
Operating Segments [Member] | Pipeline Segment    
Operating income:    
Operating income (loss) 57,794 65,028
Operating Segments [Member] | Storage Segment    
Operating income:    
Operating income (loss) 56,261 53,759
Operating Segments [Member] | Fuels Marketing Segment    
Operating income:    
Operating income (loss) 6,320 5,140
Intersegment Eliminations [Member]    
Revenues:    
Revenues (2,075) (3,943)
Operating income:    
Operating income (loss) (3) 0
Corporate, Non-Segment [Member]    
Operating income:    
General and administrative expenses 19,774 24,595
Other depreciation and amortization expense $ 2,118 $ 2,193