Fixed Assets (Schedule Of Fixed Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fixed Assets, at cost	$ 2,120,646	$ 1,899,058
Less: Accumulated depreciation	(304,876)	(268,057)
Net fixed assets	1,815,770	1,631,001
Pipelines And Related Assets [Member]
Fixed Assets, at cost	477,815	466,613
Machinery And Equipment [Member]
Fixed Assets, at cost	393,913	376,672
Transportation Equipment [Member]
Fixed Assets, at cost	17,216	18,479
Marine Vessels [Member]
Fixed Assets, at cost	750,444	731,016
Land, Buildings And Improvements [Member]
Fixed Assets, at cost	39,772	38,037
Office Equipment, Furniture And Fixtures [Member]
Fixed Assets, at cost	7,126	6,696
Construction In Progress [Member]
Fixed Assets, at cost	387,903	222,233
Property, Plant And Equipment, Other Types [Member]
Fixed Assets, at cost	$ 46,457	$ 39,312