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Inventories, net (Tables)
 12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Schedule of components of inventory
The components of inventory, net consist of the following, excluding discontinued operations:
 
December 31,
(in thousands)
 
2017
 
2016
Finished Goods
$
9,535

 
$
9,423

Work in process
766

 
443

Component parts
5,480

 
10,386

Service parts
5,965

 
5,985

 
$
21,746

 
$
26,237