Property, Plant and Equipment

12 Months Ended

Dec. 31, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment

The table below sets forth the components of property, plant and equipment as of December 31, 2021 and 2020:

(in thousands)	2021		2020		Estimated useful life
Land and land improvements	$	14,832	$	15,611	25 years for improvements
Buildings	243,584		246,137		15 to 40 years
Right of use assets	10,971		10,971		10 to 15 years
Machinery and equipment	1,067,059		1,076,092		5 to 15 years
Furniture and fixtures	7,857		8,638		5 years
Computer and other equipment	19,135		19,294		3 to 10 years
Software	63,379		62,400		5 to 8 years
Capital expenditures in progress	64,238		46,228
Property, plant and equipment, gross	1,491,055		1,485,371
Accumulated depreciation and amortization	(1,054,638)		(1,036,817)
Property, plant and equipment, net	$	436,417	$	448,554

Depreciation expense was $65.1 million in 2021, $63.3 million in 2020, and $62.1 million in 2019. Software amortization is recorded in Selling, general, and administrative expense and was $1.9 million in 2021, $2.1 million in 2020, and $2.4 million in 2019.

Capital expenditures, including purchased software, were $53.7 million in 2021, $42.4 million in 2020, and $68.0 million in 2019. Unamortized software cost was $3.9 million, $4.8 million, and $5.3 million in each of the years ended December 31, 2021, 2020, and 2019, respectively. Expenditures for maintenance and repairs are charged to income as incurred and amounted to $19.3 million in 2021, $17.7 million in 2020, and $19.8 million in 2019.