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Inventories (Tables)
 12 Months Ended
Dec. 31, 2014
Inventory Disclosure [Abstract]  
Inventories
Inventories as of December 31, 2014 and 2013 were as follows:
 
December 31,
In thousands
2014
 
2013
Raw materials
$
21,248

 
$
11,944

Work in process
15,753

 
14,546

Finished goods
15,348

 
9,537

 
52,349

 
36,027

Less: Progress billings
(1,108
)
 
(1,110
)
Total inventories
$
51,241

 
$
34,917