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Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]    
Unrealized gains (losses) on available-for-sale securities $ 1,335 $ 149
Unrealized gains (losses) on cash flow hedges 707 27
Unrealized losses on cumulative translation adjustment (4,524) (4,394)
Accumulated other comprehensive income (loss) $ (2,482) $ (4,218)