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Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accumulated other comprehensive income (loss) reflected in the Company's shareholders' equity    
Unrealized gains on available-for-sale securities $ 599 $ 149
Unrealized gains on cash flow hedges 230 27
Unrealized losses on cumulative translation adjustment (4,659) (4,394)
Accumulated other comprehensive income (loss) $ (3,830) $ (4,218)