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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
The carrying values of property, plant and equipment were as follows: 
 
December 31,
 
2018
 
2017
 
(In thousands)
Land and land improvements
$
30,173

 
$
31,963

Buildings and leasehold improvements
141,009

 
148,598

Machinery and equipment
569,359

 
543,594

Computer equipment and software
139,773

 
136,509

Construction in process
64,145

 
46,898

Gross property, plant and equipment
944,459

 
907,562

Accumulated depreciation
(578,489
)
 
(570,240
)
Net property, plant and equipment
$
365,970

 
$
337,322


Depreciation Expense
We recognized depreciation expense of $47.6 million, $45.6 million, and $47.2 million in 2018, 2017, and 2016, respectively.