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Property, Plant, and Equipment, at Cost | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant, and Equipment, at Cost | Property, Plant, and Equipment, at Cost
|  | December 31,
(in thousands) |  | 2020 |  | 2019
Land |  | $ | 37,796 |  |  | $ | 40,938 |
Land improvements |  | 58,646 |  |  | 57,635 |
Leasehold improvements |  | 2,146 |  |  | 2,122 |
Buildings |  | 183,234 |  |  | 174,600 |
Machinery and equipment |  | 1,188,396 |  |  | 1,161,409 |
Construction in progress |  | 73,234 |  |  | 29,228 |
|  | 1,543,452 |  |  | 1,465,932 |
Less accumulated depreciation and amortization |  | 878,305 |  |  | 830,493 |
Net property, plant, and equipment |  | $ | 665,147 |  |  | $ | 635,439 |
We depreciate the cost of property, plant, and equipment by the straight-line method over the following estimated useful lives:
Land improvements | 9 - 40 years
Buildings | 10 - 46 years
Machinery and equipment | 3 - 30 years
Depreciation expense was $61 million in 2020, $64 million in 2019, and $63 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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