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Comprehensive Income (Loss) - Components (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Loss:        
Beginning balance $ 136,504 $ 32,067 $ 162,266 $ (29,199)
Net other comprehensive income (loss) (19,625) 31,983 (34,325) 30,297
Ending balance 118,880 182,125 118,880 182,125
Foreign currency translation adjustment        
Accumulated Other Comprehensive Loss:        
Beginning balance (23,345) (23,915) (22,627) (23,738)
Net other comprehensive income (loss) 116 182 (602) 5
Ending balance (23,229) (23,733) (23,229) (23,733)
Unrealized gain on marketable debt securities, net        
Accumulated Other Comprehensive Loss:        
Beginning balance 1,039 288 1,576 932
Net other comprehensive income (loss) (160) 927 (697) 283
Ending balance 879 1,215 879 1,215
Accumulated other comprehensive (loss) income        
Accumulated Other Comprehensive Loss:        
Beginning balance (22,306) (23,627) (21,051) (22,806)
Ending balance $ (22,350) $ (22,518) $ (22,350) $ (22,518)