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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2021
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) | 2021 |  | 2020
Land and improvements | $ | 24,804 |  |  | $ | 22,589 |
Buildings and improvements | 163,920 |  |  | 155,669 |
Machinery and equipment | 322,653 |  |  | 324,773 |
Office equipment | 57,156 |  |  | 59,001 |
Property plant and equipment, gross | 568,533 |  |  | 562,032 |
Accumulated depreciation | (367,850) |  |  | (365,844) |
Property, plant and equipment, net | 200,683 |  |  | 196,188 |
Equipment in process | 126,284 |  |  | 76,190 |
Total property, plant and equipment, net | $ | 326,967 |  |  | $ | 272,378 |
Depreciation expense was $29.0 million, $29.3 million and $31.4 million in 2021, 2020 and 2019, 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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://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 http://asc.fasb.org/extlink&oid=120429125&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 http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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