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Balance Sheet Components Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Balance Sheet Components [Abstract]    
Derivative, Collateral, Right to Reclaim Cash $ 4,434 $ 26,809
Prepaid Expense, Current 19,652 17,536
Income Taxes Receivable, Current 11,047 822
Other Assets, Miscellaneous, Current 5,009 8,843
Other Assets, Current $ 40,142 $ 54,010