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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2015
Property, plant and equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment consist of the following:

  
December 31,
 
(in thousands)
 
2015
  
2014
 
Land and improvements
 
$
16,520
  
$
12,838
 
Buildings, building improvements and leasehold improvements
  
111,060
   
107,202
 
Furniture and equipment
  
136,528
   
130,131
 
Software
  
39,784
   
25,354
 
Construction-in-progress
  
127,489
   
117,884
 
   
431,381
   
393,409
 
Less: Accumulated depreciation and amortization
  
(99,525
)
  
(79,430
)
Total property, plant and equipment, net
 
$
331,856
  
$
313,979