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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2022
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, Plant and Equipment Our “Property, plant and equipment, net” line item in the consolidated statements of financial position consisted of the following:
| As of December 31,
(Dollars in thousands) | 2022 |  | 2021
Land and improvements | $ | 23,886 |  |  | $ | 24,804 |
Buildings and improvements | 169,548 |  |  | 163,920 |
Machinery and equipment | 334,069 |  |  | 322,653 |
Office equipment | 61,447 |  |  | 57,156 |
Property plant and equipment, gross | 588,950 |  |  | 568,533 |
Accumulated depreciation | (381,584) |  |  | (367,850) |
Property, plant and equipment, net | 207,366 |  |  | 200,683 |
Equipment in process | 151,049 |  |  | 126,284 |
Total property, plant and equipment, net | $ | 358,415 |  |  | $ | 326,967 |
Depreciation expense was $29.5 million, $29.0 million and $29.3 million in 2022, 2021 and 2020, respectively. Additionally, we recognized $47.2 million, $0.5 million and $0.6 million of impairment charges in 2022, 2021 and 2020, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI https://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126982197&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126982197&loc=d3e99779-112916 + Details
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