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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, 2016
Jun. 30, 2016
Other comprehensive income (loss) and accumulated other comprehensive items    
Beginning balance   $ 226,001
Ending balance $ 165,624 165,624
Unrealized Gains/(Losses) On Marketable Securities, net of tax    
Other comprehensive income (loss) and accumulated other comprehensive items    
Beginning balance 69 (589)
Other comprehensive income (loss) before reclassifications (40) 618
Other comprehensive income (loss) (40) 618
Ending balance 29 29
Foreign Currency Translation    
Other comprehensive income (loss) and accumulated other comprehensive items    
Beginning balance 1,015 (611)
Other comprehensive income (loss) before reclassifications (159) 1,467
Other comprehensive income (loss) (159) 1,467
Ending balance 856 856
Total Accumulated Other Comprehensive Items    
Other comprehensive income (loss) and accumulated other comprehensive items    
Beginning balance 1,084 (1,200)
Other comprehensive income (loss) before reclassifications (199) 2,085
Other comprehensive income (loss) (199) 2,085
Ending balance $ 885 $ 885