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Property, Plant and Equipment, Net | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
PROPERTY, PLANT AND EQUIPMENT, NET | PROPERTY, P LANT AND E QUIPMENT, N ET Property, plant and equipment, net at December 31 was as follows:
| 2020 |  | 2019
| (Dollars in thousands)
Land | $ | 89,304 |  |  | $ | 77,233 |
Buildings and improvements | 559,773 |  |  | 493,035 |
Machinery and equipment | 3,337,536 |  |  | 3,009,591 |
Construction in progress | 199,635 |  |  | 167,635 |
| 4,186,248 |  |  | 3,747,494 |
Accumulated depreciation | (2,345,490) |  |  | (2,177,163) |
| $ | 1,840,758 |  |  | $ | 1,570,331 |
Depreciation expense in 2020, 2019 and 2018 was $182.9 million, $179.3 million and $164.1 million, 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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