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Property, Plant and Equipment, net
 12 Months Ended
Dec. 31, 2023
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net Property, Plant and Equipment, net
 
Property, plant and equipment consisted of the following:
 December 31,
 (in thousands)
20232022
Land$62,587 $50,025 
Buildings and site improvements246,021 233,123 
Leasehold improvements7,782 6,367 
Machinery and equipment516,017 472,907 
 832,407 762,422 
Less accumulated depreciation and amortization(474,974)(432,392)
 357,433 330,030 
Capital projects in progress61,179 31,525 
 $418,612 $361,555 
 
Property, plant and equipment as of December 31, 2023, and 2022, includes fully depreciated assets with an original cost of $352.5 million and $253.5 million, respectively, which are still in use. The Company capitalizes certain development costs associated with internal use software, including the direct costs of services provided by third-party consultants and payroll for internal employees, both of which are performing development and implementation activities on a software project. As of December 31, 2023, and 2022, the Company had capitalized software development costs net of accumulated amortization of $33.8 million and $33.3 million, respectively, included in machinery and equipment and as of December 31, 2023, and 2022, $9.7 million and $7.0 million, respectively, was included in capital projects in progress.
Depreciation expense, including depreciation of equipment and amortization of internally developed and acquired software, was $51.2 million, $43.4 million, and $36.1 million for the years ended December 31, 2023, 2022 and 2021, respectively.