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Shareholders' Equity - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive loss $ (21,651) $ (12,752)
Unrealized gain (loss) on investments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive loss 220 (519)
Foreign currency translation adjustments    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Total accumulated other comprehensive loss $ (21,871) $ (12,233)