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Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Components of inventory Components of inventories at March 31, 2018 and December 31, 2017 were as follows: 
 
March 31, 2018
 
December 31, 2017
Natural gas liquids
$
18,922

 
$
47,462

Sulfur
11,299

 
8,436

Sulfur based products
19,107

 
18,674

Lubricants
21,874

 
20,086

Other
2,692

 
2,594

 
$
73,894

 
$
97,252