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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment

Property, plant and equipment consist of the following (in thousands):

 
December 31,
 
2017
 
2016
Land
$
17,846

 
$
17,410

Buildings and leasehold improvements
106,316

 
88,825

Furniture and equipment
202,897

 
160,546

 
327,059

 
266,781

Accumulated depreciation
(130,814
)
 
(108,425
)
 
196,245

 
158,356

Construction in progress
117,173

 
80,048

Property, plant and equipment, net
$
313,418

 
$
238,404



At December 31, 2017 and 2016, property, plant and equipment carrying a net book value of $82.8 million and $65.1 million, respectively, was located outside the United States. The 2017 increase in Property, Plant and Equipment is due primarily to spending on equipment for compliance with DSCSA requirements and expansion initiatives at our Cranbury, Decatur and Somerset facilities.

Depreciation expense was $23.7 million, $22.2 million and $19.9 million for the years ended December 31, 2017, 2016 and 2015, respectively.