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Property, Plant and Equipment, Net
 6 Months Ended
Jun. 30, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net
Property, Plant and Equipment, Net
 
Property, plant and equipment, net, at the dates indicated consisted of the following: 
 
At June 30,
 
At December 31,
(in thousands)
2018
 
2017
 
2017
Land
$
32,121

 
$
32,686

 
$
33,087

Buildings and site improvements
209,888

 
201,723

 
212,817

Leasehold improvements
4,709

 
5,605

 
4,684

Machinery, equipment, and software
320,131

 
272,072

 
300,334

 
566,849

 
512,086

 
550,922

Less accumulated depreciation and amortization
(313,088
)
 
(288,287
)
 
(299,907
)
 
253,761

 
223,799

 
251,015

Capital projects in progress
15,366

 
37,563

 
22,005

 
$
269,127

 
$
261,362

 
$
273,020