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Property, Plant and Equipment | 12 Months Ended
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Dec. 31, 2019
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | Property, plant and equipment are comprised of the following amounts:
|  | As of December 31,
2019 |  | 2018
Property, plant and equipment |  |  |  |
Land and buildings |  | $ | 80,647 |  |  | $ | 69,455 |
Machinery and equipment |  | 433,016 |  |  | 401,729 |
Construction in progress |  | 38,829 |  |  | 35,122 |
Total |  | 552,492 |  |  | 506,306 |
Less: Accumulated depreciation |  | 177,979 |  |  | 145,278 |
Property, plant and equipment, net |  | $ | 374,513 |  |  | $ | 361,028 |
We monitor property, plant and equipment for any indicators of potential impairment. We recognized an impairment charge of $0.6 million and $5.2 million for the years ended December 31, 2019 and 2018, respectively, related to the early retirement of identified fixed assets. The impairment charge was recorded to the “Other operating (income) expense, net,” line item on the Consolidated Statements of Operations and Comprehensive Income (Loss). The impairment charge was determined by writing the assets down to the estimated salvage value, less disposal costs. We recorded no impairment charge for the year ended December 31, 2017. For the years ended December 31, 2019, 2018, and 2017, we recorded depreciation expense of $44.8 million, $38.6 million, and $28.9 million, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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