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Balance Sheet Components (Reclassifications Out Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                              
Unrealized gains on investments                         $ 102,767 $ 113,523 $ 42,039
Income tax loss                         (82,022) (64,753) 28,867
Net loss $ (50,580) $ 15,035 $ 55,947 $ (21,109) $ (53,998) $ (146,082) $ 16,217 $ 11,864 $ (2,337) $ (10,078) $ (11,251) $ (12,919) (707) $ (171,999) $ (36,585)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Investments [Member]                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                              
Unrealized gains on investments                         2,029    
Income tax loss                         (2,540)    
Net loss                         5,927    
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income [Member] | Unrealized (Loss) Gains on Hedging Activities [Member]                              
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                              
Cost of net revenues                         $ 6,438