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Balance Sheet Components - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Defined benefit pension and other postretirement benefit plans $ (135,596) $ (143,389)
Unrealized foreign currency translation gain 12,476 4,289
Unrealized loss on foreign currency forward contracts, interest rate swaps and available-for-sale securities (12,837) (10,206)
Total accumulated other comprehensive loss, net of tax $ (135,957) $ (149,306)