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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 The table below sets forth the components of property, plant and equipment as of December 31, 2021 and 2020:
(in thousands) |  | 2021 |  | 2020 |  | Estimated useful life
Land and land improvements |  | $ | 14,832 |  |  | $ | 15,611 |  |  | 25 years for improvements
Buildings |  | 243,584 |  |  | 246,137 |  |  | 15 to 40 years
Right of use assets |  | 10,971 |  |  | 10,971 |  |  | 10 to 15 years
Machinery and equipment |  | 1,067,059 |  |  | 1,076,092 |  |  | 5 to 15 years
Furniture and fixtures |  | 7,857 |  |  | 8,638 |  |  | 5 years
Computer and other equipment |  | 19,135 |  |  | 19,294 |  |  | 3 to 10 years
Software |  | 63,379 |  |  | 62,400 |  |  | 5 to 8 years
Capital expenditures in progress |  | 64,238 |  |  | 46,228 |  |  |
Property, plant and equipment, gross |  | 1,491,055 |  |  | 1,485,371 |  |  |
Accumulated depreciation and amortization |  | (1,054,638) |  |  | (1,036,817) |  |  |
Property, plant and equipment, net |  | $ | 436,417 |  |  | $ | 448,554 |  |  |
Depreciation expense was $65.1 million in 2021, $63.3 million in 2020, and $62.1 million in 2019. Software amortization is recorded in Selling, general, and administrative expense and was $1.9 million in 2021, $2.1 million in 2020, and $2.4 million in 2019. Capital expenditures, including purchased software, were $53.7 million in 2021, $42.4 million in 2020, and $68.0 million in 2019. Unamortized software cost was $3.9 million, $4.8 million, and $5.3 million in each of the years ended December 31, 2021, 2020, and 2019, respectively. Expenditures for maintenance and repairs are charged to income as incurred and amounted to $19.3 million in 2021, $17.7 million in 2020, and $19.8 million in 2019.

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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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