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Balance Sheet Components - Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Balance Sheet Components Disclosure [Abstract]    
Trade receivables $ 539,916 $ 454,399
Prepaid expenses 214,350 180,999
Other receivables 541,631 524,669
Total other current assets $ 1,295,897 $ 1,160,067