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Other comprehensive income (loss) and accumulated other comprehensive items (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other comprehensive income (loss)      
Balance at the beginning of the period $ 594,330 $ 350,727 $ 156,437
Balance at the end of the period 481,982 594,330 350,727
Unrealized Gains/(Losses) On Marketable Securities, net of tax      
Other comprehensive income (loss)      
Balance at the beginning of the period 755 31 22
Other comprehensive income (loss) before reclassifications 1,145 724 9
Other comprehensive income (loss) 1,145 724 9
Balance at the end of the period 1,900 755 31
Foreign Currency Translation      
Other comprehensive income (loss)      
Balance at the beginning of the period (11,339) 1,431 3,947
Other comprehensive income (loss) before reclassifications (51,518) (12,770) (2,516)
Other comprehensive income (loss) (51,518) (12,770) (2,516)
Balance at the end of the period (62,857) (11,339) 1,431
Accumulated other comprehensive income (loss)      
Other comprehensive income (loss)      
Balance at the beginning of the period (10,584) 1,462 3,969
Other comprehensive income (loss) before reclassifications (50,373) (12,046) (2,507)
Other comprehensive income (loss) (50,373) (12,046) (2,507)
Balance at the end of the period $ (60,957) $ (10,584) $ 1,462