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Property, plant and equipment
 6 Months Ended
Jun. 30, 2017
Property, plant and equipment [Abstract]  
Property, plant and equipment
5. Property, plant and equipment

Property, plant and equipment consisted of the following:

  
June 30,
  
December 31,
 
(in thousands) 
 
2017
  
2016
 
Land and improvements
 
$
20,357
  
$
20,340
 
Buildings, building improvements and leasehold improvements
  
150,416
   
147,130
 
Furniture and equipment
  
194,140
   
190,157
 
Software
  
52,616
   
52,564
 
Construction-in-progress
  
90,095
   
77,813
 
Property, plant and equipment, gross
  
507,624
   
488,004
 
Less: Accumulated depreciation and amortization
  
(127,384
)
  
(111,556
)
Total property, plant and equipment, net
 
$
380,240
  
$
376,448
 

As of June 30, 2017 and December 31, 2016, construction-in-progress primarily includes costs related to the build out of the Company's Center for Innovation in Advanced Development and Manufacturing ("CIADM") facility.