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Comprehensive Income (Loss) - Components (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Loss:    
Beginning balance $ 162,266 $ (29,199)
Net other comprehensive loss (14,700) (1,686)
Ending balance 136,504 32,067
Foreign currency translation adjustment    
Accumulated Other Comprehensive Loss:    
Beginning balance (22,627) (23,738)
Net other comprehensive loss (718) (177)
Ending balance (23,345) (23,915)
Unrealized gain on marketable debt securities, net    
Accumulated Other Comprehensive Loss:    
Beginning balance 1,576 932
Net other comprehensive loss (537) (644)
Ending balance 1,039 288
Accumulated other comprehensive (loss) income    
Accumulated Other Comprehensive Loss:    
Beginning balance (21,051) (22,806)
Ending balance $ (22,306) $ (23,627)