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Other comprehensive income (loss) and accumulated other comprehensive items - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Other comprehensive income (loss) and accumulated other comprehensive items    
Balance at the beginning of the period $ 572,494 $ 594,330
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at the end of the period 510,954 510,954
Unrealized Gains/(Losses) On Marketable Securities, net of tax    
Other comprehensive income (loss) and accumulated other comprehensive items    
Balance at the beginning of the period 3,410 755
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Other comprehensive income before reclassifications (1,016) 1,639
Amounts reclassified from other comprehensive items 0 0
Other comprehensive income (loss) (1,016) 1,639
Balance at the end of the period 2,394 2,394
Foreign Currency Translation    
Other comprehensive income (loss) and accumulated other comprehensive items    
Balance at the beginning of the period (13,426) (11,339)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Other comprehensive income before reclassifications (24,695) (26,782)
Amounts reclassified from other comprehensive items 0 0
Other comprehensive income (loss) (24,695) (26,782)
Balance at the end of the period (38,121) (38,121)
Accumulated other comprehensive income (loss)    
Other comprehensive income (loss) and accumulated other comprehensive items    
Balance at the beginning of the period (10,016) (10,584)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Other comprehensive income before reclassifications (25,711) (25,143)
Amounts reclassified from other comprehensive items 0 0
Other comprehensive income (loss) (25,711) (25,143)
Balance at the end of the period $ (35,727) $ (35,727)