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Inventories (Tables)
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule Of Major Components Of Inventories
The major components of inventories were as follows:
 
June 30,
2017
 
December 31,
2016
Petroleum products
$
11,703

 
$
11,550

Crude oil
41,816

 
73,133

Caustic soda
5,723

 
4,593

NaHS
9,524

 
9,304

Other
21

 
7

Total
$
68,787

 
$
98,587