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Other comprehensive income (loss) and accumulated other comprehensive items (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
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 984
Amounts reclassified from other comprehensive items 0
Other comprehensive (loss) income 984
Ending balance 150,308
Unrealized Gains/(Losses) On Marketable Securities, net of tax  
Other comprehensive income (loss) and accumulated other comprehensive items  
Beginning balance 22
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Other comprehensive income before reclassifications (123)
Amounts reclassified from other comprehensive items 0
Other comprehensive (loss) income (123)
Ending balance (101)
Foreign Currency Translation  
Other comprehensive income (loss) and accumulated other comprehensive items  
Beginning balance 3,947
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Other comprehensive income before reclassifications 1,107
Amounts reclassified from other comprehensive items 0
Other comprehensive (loss) income 1,107
Ending balance 5,054
AOCI Attributable to Parent  
Other comprehensive income (loss) and accumulated other comprehensive items  
Beginning balance 3,969
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]  
Ending balance $ 4,953