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Severance and Other Charges (Credits), net (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring and Related Activities [Abstract]
Severance and other costs		$ 4,552	$ 2,697	$ 16,525
Fixed asset retirements and abandonments		0	6,454	29,881
Inventory impairment	$ 51,200	0	51,181	0
Accounts receivable write-off (recovery)	$ 15,000	(4,862)	15,022	0
Severance and other charges (credits), net		$ (310)	$ 75,354	$ 46,406

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- Definition

Allowance For Doubtful Accounts Receivable, Write-Offs (Recoveries)

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Restructuring, Settlement And Impairment Provisions (Credits)

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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