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Property, plant and equipment
12 Months Ended
Dec. 31, 2016
Property, plant and equipment [Abstract]  
Property, plant and equipment
7. 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
 

For the year ended December 31, 2016, construction-in-progress primarily includes costs related to the build out of the Company's CIADM manufacturing facility. For the year ended December 31, 2015, construction-in-progress primarily included costs related to Building 55, the Company's large-scale manufacturing facility which was placed in service in June 2016.

Depreciation and amortization expense was $28.0 million, $23.7 million and $22.3 million for the years ended December 31, 2016, 2015 and 2014, respectively.