Property, Plant and Equipment

12 Months Ended

Dec. 31, 2022

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment

Property, plant and equipment are comprised of the following amounts:

	As of December 31,
	2022		2021
Land and buildings	$	58,256	$	57,991
Machinery and equipment	353,364		344,041
Construction in progress	11,063		5,009
Total	422,683		407,041
Less: Accumulated depreciation	225,046		197,936
Property, plant and equipment, net	$	197,637	$	209,105

For the years ended December 31, 2022, 2021, and 2020, we recorded depreciation expense of $31.4 million, $31.8 million, and $31.3 million, respectively.

We monitor property, plant and equipment for any indicators of potential impairment. There were no impairment charges for the years ended December 31, 2022 and 2021. We recognized an impairment charge of $4.1 million for the year ended December 31, 2020, related to the early retirement of identified fixed assets. The impairment charge was recorded to the “Other operating expense (income), net,” line item on the Consolidated Statements of Operations and Comprehensive Income (Loss). The impairment charge was determined by writing the assets down to the estimated salvage value, less disposal costs.