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Equity (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Accumulated realized and unrealized gain (loss) on available-for-sale securities, net $ (58) $ 40 $ 35
Accumulated foreign currency translation adjustments 115 (7,494) (6,756)
Accumulated unrealized gain on derivative instruments, net 26 26 26
Total other comprehensive income (loss) $ 83 $ (7,428) $ (6,695)