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Inventories (Tables)
6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consisted of the following:


June 30,
2015
 
December 31,
2014
 
 
 
 
 
(in thousands)
Finished goods
$
8,569

 
$
12,393

Raw materials and precious metals
10,041

 
9,333

Parts and supplies
17,111

 
13,888

 
$
35,721

 
$
35,614