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Other comprehensive income (loss) and accumulated other comprehensive items - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Other comprehensive income (loss) and accumulated other comprehensive items    
Balance at the beginning of the period $ 528,734 $ 594,330
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Other comprehensive income before reclassifications (8,031) 568
Amounts reclassified from other comprehensive items 0 0
Other comprehensive income (loss) (8,031) 568
Balance at the end of the period 572,494 572,494
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 692 755
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Other comprehensive income before reclassifications 2,718 2,655
Amounts reclassified from other comprehensive items 0 0
Other comprehensive income (loss) 2,718 2,655
Balance at the end of the period 3,410 3,410
Foreign Currency Translation    
Other comprehensive income (loss) and accumulated other comprehensive items    
Balance at the beginning of the period (2,677) (11,339)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Other comprehensive income before reclassifications (10,749) (2,087)
Amounts reclassified from other comprehensive items 0 0
Other comprehensive income (loss) (10,749) (2,087)
Balance at the end of the period (13,426) (13,426)
AOCI Attributable to Parent    
Other comprehensive income (loss) and accumulated other comprehensive items    
Balance at the beginning of the period (1,985) (10,584)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Balance at the end of the period $ (10,016) $ (10,016)