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Certain Balance Sheet Components Depreciation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 12,112 $ 13,059 $ 24,949 $ 25,925