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Equity (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accumulated other comprehensive income (loss) reflected in the Company's shareholders' equity    
Unrealized gains on available-for-sale securities $ 640 $ 1,335
Unrealized gains on cash flow hedges 3,068 707
Unrealized losses on cumulative translation adjustment (4,633) (4,524)
Accumulated other comprehensive income $ (925) $ (2,482)