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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2023
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,
20232022
Land and buildings$61,007 $58,256 
Machinery and equipment375,352 353,364 
Construction in progress3,466 11,063 
Gross cost439,825 422,683 
Less: Accumulated depreciation254,013 225,046 
Property, plant and equipment, net$185,812 $197,637 
For the years ended December 31, 2023, 2022, and 2021, we recorded depreciation expense of $32.0 million, $31.4 million, and $31.8 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, 2023, 2022 and 2021.