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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 Property, plant and equipment are comprised of the following amounts:
|  | As of December 31,
2020 |  | 2019
Property, plant and equipment |  |  |  |
Land and buildings |  | $ | 58,296 |  |  | $ | 57,222 |
Machinery and equipment |  | 339,268 |  |  | 321,110 |
Construction in progress |  | 1,270 |  |  | 25,416 |
Total |  | 398,834 |  |  | 403,748 |
Less: Accumulated depreciation |  | 175,144 |  |  | 147,771 |
Property, plant and equipment, net |  | $ | 223,690 |  |  | $ | 255,977 |
We monitor property, plant and equipment for any indicators of potential impairment. We recognized impairment charges of $4.1 million, $0.6 million, and $5.2 million for the years ended December 31, 2020, 2019, and 2018, respectively, related to the early retirement of identified fixed assets. The impairment charges were recorded to the “Other operating expense, net,” line item on the Consolidated Statements of Operations and Comprehensive Income (Loss). The impairment charges were determined by writing the assets down to the estimated salvage value, less disposal costs. For the years ended December 31, 2020, 2019, and 2018, we recorded depreciation expense of $31.3 million, $30.4 million, and $28.5 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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