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Inventories (Tables)
 6 Months Ended
Jun. 30, 2016
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
Inventories were as follows:
 
June 30,
2016
 
December 31,
2015
 
(In thousands)
Lubricants
$
10,470

 
$
14,959

Refined products
108

 
241

Inventories
$
10,578

 
$
15,200