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Property, plant and equipment (Tables)
12 Months Ended
Dec. 31, 2016
Property, plant and equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment consist of the following:

  
December 31,
 
(in thousands)
 
2016
  
2015
 
Land and improvements
 
$
20,340
  
$
16,520
 
Buildings, building improvements and leasehold improvements
  
147,130
   
108,908
 
Furniture and equipment
  
190,157
   
129,933
 
Software
  
52,564
   
39,683
 
Construction-in-progress
  
77,813
   
126,531
 
   
488,004
   
421,575
 
Less: Accumulated depreciation and amortization
  
(111,556
)
  
(93,767
)
Total property, plant and equipment, net
 
$
376,448
  
$
327,808