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Other comprehensive income (loss) and accumulated other comprehensive items (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Other comprehensive income (loss) and accumulated other comprehensive items    
Beginning balance   $ 156,437
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Other comprehensive income before reclassifications $ (3,098) (2,114)
Amounts reclassified from other comprehensive items 0 0
Other comprehensive loss (3,098) (2,114)
Ending balance 267,402 267,402
Unrealized Gains/(Losses) On Marketable Securities, net of tax    
Other comprehensive income (loss) and accumulated other comprehensive items    
Beginning balance (101) 22
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Other comprehensive income before reclassifications 40 (83)
Amounts reclassified from other comprehensive items 0 0
Other comprehensive loss 40 (83)
Ending balance (61) (61)
Foreign Currency Translation    
Other comprehensive income (loss) and accumulated other comprehensive items    
Beginning balance 5,054 3,947
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Other comprehensive income before reclassifications (3,138) (2,031)
Amounts reclassified from other comprehensive items 0 0
Other comprehensive loss (3,138) (2,031)
Ending balance 1,916 1,916
AOCI Attributable to Parent    
Other comprehensive income (loss) and accumulated other comprehensive items    
Beginning balance 4,953 3,969
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Ending balance $ 1,855 $ 1,855