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Balance Sheet Components - Other Noncurrent Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Pension and other postretirement benefits $ 127,841 $ 127,837
Deferred revenue 69,934 74,646
Lease liabilities 97,403 49,970
Other 85,443 95,069
Other noncurrent liabilities $ 380,621 $ 347,522