Property, Plant and Equipment, net

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]

Property, plant and equipment consisted of the following:


	December 31,
(in thousands)	2022		2021
Land	$	50,025	$	28,175
Buildings and site improvements	233,123		202,393
Leasehold improvements	6,367		5,995
Machinery and equipment	472,907		399,079
	762,422		635,642
Less accumulated depreciation and amortization	(432,392)		(402,246)
	330,030		233,396
Capital projects in progress	31,525		26,473
	$	361,555	$	259,869

Property, plant and equipment as of December 31, 2022, and 2021, includes fully depreciated assets with an original cost of $253.5 million and $234.0 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, 2022, and 2021, the Company had capitalized software development costs net of accumulated amortization of $33.3 million and $30.2 million, respectively, included in machinery and equipment and as of December 31, 2022, and 2021, $7.0 million and $4.8 million, respectively, was included in capital projects in progress.

Depreciation expense, including depreciation of equipment and amortization of internally developed software and software acquired through capital lease arrangements, was $43.4 million, $36.1 million, and $32.1 million for the years ended December 31, 2022, 2021 and 2020, respectively.