v3.8.0.1
SEGMENT INFORMATION Table 2 - Assets by Reportable Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Segment Information    
Total assets $ 6,586,713 $ 6,535,233
Other Partnership Assets    
Segment Information    
Total assets 187,122 188,507
Operating Segments [Member]    
Segment Information    
Total assets 6,399,591 6,346,726
Operating Segments [Member] | Pipeline Segment    
Segment Information    
Total assets 3,516,435 3,492,417
Operating Segments [Member] | Storage Segment    
Segment Information    
Total assets 2,761,667 2,735,563
Operating Segments [Member] | Fuels Marketing Segment    
Segment Information    
Total assets $ 121,489 $ 118,746