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Other comprehensive income (loss) and accumulated other comprehensive items (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Other comprehensive income (loss) and accumulated other comprehensive items  
Balance at the beginning of the period $ 350,727
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Other comprehensive income before reclassifications (657)
Amounts reclassified from other comprehensive items 0
Other comprehensive income (loss) (657)
Balance at the end of the period 512,942
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 31
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Other comprehensive income before reclassifications 59
Amounts reclassified from other comprehensive items 0
Other comprehensive income (loss) 59
Balance at the end of the period 90
Foreign Currency Translation  
Other comprehensive income (loss) and accumulated other comprehensive items  
Balance at the beginning of the period 1,431
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Other comprehensive income before reclassifications (716)
Amounts reclassified from other comprehensive items 0
Other comprehensive income (loss) (716)
Balance at the end of the period 715
AOCI Attributable to Parent  
Other comprehensive income (loss) and accumulated other comprehensive items  
Balance at the beginning of the period 1,462
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Balance at the end of the period $ 805