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Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at December 31, 2015     $ (22,331)  
Other comprehensive income $ (252) $ (8,289) 6,485 $ (12,354)
Balance at September 30, 2016 (15,846)   (15,846)  
Foreign Currency Translation Adjustments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at December 31, 2015     (22,333)  
Other comprehensive income     6,479  
Balance at September 30, 2016 (15,854)   (15,854)  
Change in Unrealized Gain/(Loss) on Available-For-Sale Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at December 31, 2015     2  
Other comprehensive income     6  
Balance at September 30, 2016 $ 8   $ 8