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Balance Sheet Components - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Defined benefit pension and other postretirement benefit plans	$ (143,389)	$ (139,430)
Unrealized foreign currency translation gain	4,289	7,201
Unrealized loss on foreign currency forward contracts, interest rate swaps and available-for-sale securities	(10,206)	(495)
Total accumulated other comprehensive loss, net of tax	$ (149,306)	$ (132,724)

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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