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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
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,
 20202019
 (In thousands)
Land and land improvements$29,321 $27,502 
Buildings and leasehold improvements136,427 126,580 
Machinery and equipment608,618 558,639 
Computer equipment and software137,512 119,533 
Construction in process63,589 70,993 
Gross property, plant and equipment975,467 903,247 
Accumulated depreciation(606,847)(557,329)
Net property, plant and equipment$368,620 $345,918 
Depreciation Expense
We recognized depreciation expense in income from continuing operations of $42.5 million, $40.4 million, and $38.3 million in 2020, 2019, and 2018, respectively.