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Property, Plant and Equipment, Net
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, Net Property, Plant and Equipment, Net
The components of property, plant and equipment, net were as follows:
(in thousands)
December 31,
2019
 
December 31,
2018
Land
$
14,551

 
$
14,515

Buildings and improvements
146,727

 
142,113

Machinery and equipment
171,230

 
160,707

Furniture, computers and equipment
40,143

 
36,405

Computer software
70,458

 
62,517

Construction in progress
25,044

 
19,999

Property, plant and equipment, gross
468,153

 
436,256

Accumulated depreciation and amortization
(236,578
)
 
(207,868
)
Property, plant and equipment, net
$
231,575

 
$
228,388


During the years ended December 31, 2019, 2018 and 2017, software development costs of $11.8 million, $4.1 million and $3.1 million were capitalized. Capitalized software development costs as of December 31, 2019, 2018 and 2017 consisted of software placed into service of $7.2 million, $1.7 million and $2.4 million, respectively, and amounts recorded in construction in progress of $4.6 million, $2.4 million and $0.7 million, respectively. Amortization expense on capitalized software development costs was $6.6 million, $6.3 million and $6.4 million for the years ended December 31, 2019, 2018 and 2017, respectively.
Total depreciation and amortization expense related to property, plant and equipment was $32.4 million, $32.2 million and $31.6 million for the years ended December 31, 2019, 2018 and 2017, respectively.