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Inventories (Tables)
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventories
Inventories at the respective balance sheet dates consisted of the following:
(in thousands)
March 31, 2018
 
December 31, 2017
Raw materials and consumables
$
10,336

 
$
10,082

Total inventories
$
10,336

 
$
10,082