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Impairment and Other Charges (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Impairment and Other Charges |  |
Long-lived asset impairments (1) | $ 204,765 |
Abandonment of assets (2) | 5,976 | $ 35,861
Pension settlement loss (3) | 4,660 |
Severance costs | 1,882 | 5,748
Assets held for sale write down (4) | 192 | 14,326
Retirement of equipment |  | 17,218
Inventory write-downs |  | 9,077
Other | 18 | 43
Total | $ 217,493 | $ 82,273

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- Definition Amount of write-down of assets and other charges recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References No definition available. + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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