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Property, plant and equipment
 12 Months Ended
Dec. 31, 2017
Property, plant and equipment [Abstract]  
Property, plant and equipment
8. Property, plant and equipment

Property, plant and equipment consist of the following:

  
December 31,
 
(in thousands)
 
2017
  
2016
 
Land and improvements
 
$
21,843
  
$
20,340
 
Buildings, building improvements and leasehold improvements
  
160,005
   
147,130
 
Furniture and equipment
  
206,819
   
190,157
 
Software
  
50,829
   
52,564
 
Construction-in-progress
  
100,088
   
77,813
 
   
539,584
   
488,004
 
Less: Accumulated depreciation and amortization
  
(132,374
)
  
(111,556
)
Total property, plant and equipment, net
 
$
407,210
  
$
376,448
 

For the year ended December 31, 2017 and 2016, construction-in-progress primarily includes costs related to the build out of the Company's CIADM manufacturing facility.

Depreciation and amortization expense was $32.2 million, $28.0 million and $23.7 million for the years ended December 31, 2017, 2016, and 2015, respectively.