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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
7.
Property, Plant and Equipment
Property, Plant and Equipment and related Accumulated Depreciation, including equipment under capital leases, as of December 31, consisted of the following:
 
2017
 
2016
Property, Plant and Equipment:
 
 
 
Land
$
18,152

 
$
6,328

Buildings and improvements
96,230

 
58,577

Machinery and manufacturing equipment
151,645

 
116,221

Office equipment
107,312

 
89,838

Work in progress
9,429

 
27,536

Total Property, Plant and Equipment
382,768

 
298,500

Less: Accumulated Depreciation
(202,750
)
 
(186,403
)
Property, Plant and Equipment, Net
$
180,018

 
$
112,097


Depreciation expense was $26,199 in 2017, $17,891 in 2016 and $16,550 in 2015.