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Severance and Other Charges (Tables) | 12 Months Ended
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Dec. 31, 2017
Restructuring and Related Activities [Abstract] |
Summary of Severance and Other Charges | Our severance and other charges are summarized below (in thousands):
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Severance and other costs | $ | 2,697 |  |  | $ | 16,525 |  |  | $ | 35,484 |
Fixed asset retirements and abandonments | 6,454 |  |  | 29,881 |  |  | — |
Inventory impairment | 51,181 |  |  | — |  |  | — |
Accounts receivable write-offs | 15,022 |  |  | — |  |  | — |
| $ | 75,354 |  |  | $ | 46,406 |  |  | $ | 35,484 |

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- Definition Tabular disclosure of costs incurred for restructuring including, but not limited to, exit and disposal activities, remediation, implementation, integration, asset impairment, and charges against earnings from the write-down of assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 + Details
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