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Inventories (Tables)
 9 Months Ended
Sep. 30, 2016
Inventory Disclosure [Abstract]  
Inventories
Inventories as of September 30, 2016 and December 31, 2015 were as follows:
In thousands
 
September 30,
2016
 
December 31,
2015
Raw materials
 
$
26,061

 
$
17,128

Work in process
 
15,058

 
14,670

Finished goods
 
22,395

 
15,048

 
 
63,514

 
46,846

Less: Progress billings
 
(1,102
)
 
(316
)
Total inventories
 
$
62,412

 
$
46,530