Accrued Liabilities (Narrative) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2018 USD ($)
Duarte Relocation Restructuring Charge Reserve
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 17,013

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration