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Inventory (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory
Our inventory, net of allowance for obsolescence of  $19,000 at March 31, 2019 and December 31, 2018, respectively, consisted of the following amounts:
March 31, 2019December 31, 2018
(in thousands)
Raw materials - current
$29,821 $26,152 
Raw materials - long term, net3,997 3,980 
Finished Goods1,022 1,022 
Work in process
4,656 3,800 
$39,496 $34,954