BUSINESS SEGMENTS - Revenue by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue:
Total revenue	$ 780,594	$ 1,088,100
United States
Revenue:
Total revenue	696,889	1,005,061
International
Revenue:
Total revenue	83,705	83,039
Operating Segments | Domestic Pipelines & Terminals
Revenue:
Total revenue	237,953	243,571
Operating Segments | Global Marine Terminals
Revenue:
Total revenue	170,064	120,984
Operating Segments | Merchant Services
Revenue:
Total revenue	389,737	740,160
Intersegment
Revenue:
Total revenue	$ (17,160)	$ (16,615)