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Comprehensive Income (Loss) - Components (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accumulated Other Comprehensive Loss:        
Beginning balance $ 182,125 $ (17,777) $ (29,199) $ 2,780
Net other comprehensive income (loss) (11,103) (8,988) 19,194 (30,043)
Ending balance 171,200 (26,963) 171,200 (26,963)
Foreign currency translation adjustment        
Accumulated Other Comprehensive Loss:        
Beginning balance (23,733) (23,720) (23,738) (23,621)
Net other comprehensive income (loss) 534 (210) 539 (309)
Ending balance (23,199) (23,930) (23,199) (23,930)
Unrealized gain on marketable debt securities, net        
Accumulated Other Comprehensive Loss:        
Beginning balance 1,215 872 932 205
Net other comprehensive income (loss) 66 86 349 753
Ending balance 1,281 958 1,281 958
Accumulated other comprehensive (loss) income        
Accumulated Other Comprehensive Loss:        
Beginning balance (22,518) (22,848) (22,806) (23,416)
Ending balance $ (21,918) $ (22,972) $ (21,918) $ (22,972)