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Property, plant and equipment (Tables)
9 Months Ended
Sep. 30, 2018
Property, plant and equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consisted of the following:

  
September 30,
  
December 31,
 
(in thousands) 
 
2018
  
2017
 
Land and improvements
 
$
21,848
  
$
21,843
 
Buildings, building improvements and leasehold improvements
  
161,175
   
160,005
 
Furniture and equipment
  
217,908
   
206,819
 
Software
  
53,180
   
50,829
 
Construction-in-progress
  
141,348
   
100,088
 
Property, plant and equipment, gross
  
595,459
   
539,584
 
Less: Accumulated depreciation and amortization
  
(160,384
)
  
(132,374
)
Total property, plant and equipment, net
 
$
435,075
  
$
407,210