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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2020
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) | 2020 |  | 2019
Land and improvements | $ | 22,589 |  |  | $ | 21,697 |
Buildings and improvements | 155,669 |  |  | 165,968 |
Machinery and equipment | 324,773 |  |  | 281,771 |
Office equipment | 59,001 |  |  | 68,349 |
Property plant and equipment, gross | 562,032 |  |  | 537,785 |
Accumulated depreciation | (365,844) |  |  | (341,119) |
Property, plant and equipment, net | 196,188 |  |  | 196,666 |
Equipment in process | 76,190 |  |  | 63,580 |
Total property, plant and equipment, net | $ | 272,378 |  |  | $ | 260,246 |
Depreciation expense was $29.3 million in 2020, $31.4 million in 2019 and $33.5 million in 2018.

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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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