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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consist of the following:
 
As of December 31
(in thousands)
2017
 
2016
Land
$
16,190

 
$
10,410

Buildings
107,932

 
88,256

Machinery, equipment and fixtures
387,914

 
433,652

Leasehold improvements
215,445

 
209,612

Construction in progress
16,649

 
36,728

 
744,130

 
778,658

Less accumulated depreciation
(484,772
)
 
(544,994
)
 
$
259,358

 
$
233,664