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Goodwill and Other Intangible Assets (Details 1) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill [Line Items]        
Goodwill, Beginning Balance   $ 34,230 $ 48,032 $ 58,326
Currency translation adjustments   206 (750) (806)
Goodwill, Ending Balance   257,302 34,230 48,032
SemGas [Member]        
Goodwill [Line Items]        
Goodwill, Impairment Loss     (13,052)  
Crude Transportation [Member]        
Goodwill [Line Items]        
Goodwill, Beginning Balance   26,628    
Goodwill, Impairment Loss $ (26,600) (26,628)   $ (9,488)
Goodwill, Ending Balance   0 26,628  
HFOTCO LLC [Member]        
Goodwill [Line Items]        
Goodwill, Beginning Balance   0    
Goodwill, Acquired During Period   257,302    
Goodwill, Ending Balance   257,302 $ 0  
SemMexico [Member]        
Goodwill [Line Items]        
Goodwill, Reclassification to Held-for-sale   $ (7,808)