Reportable Segments (Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Reportable Segments
Total Assets	$ 693,859	$ 735,259
Operating segment | Crude oil pipelines and storage
Reportable Segments
Total Assets	388,742	408,304
Operating segment | Refined products terminals and storage
Reportable Segments
Total Assets	132,056	131,931
Operating segment | NGL distribution and sales
Reportable Segments
Total Assets	158,863	173,558
Corporate and other
Reportable Segments
Total Assets	$ 14,198	12,092
Held-for-sale | Held-for-sale
Reportable Segments
Total Assets		$ 9,374