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Marketable Securities (Held-To-Maturity Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]    
Aggregate fair value [1] $ 13,630 $ 24,046
Gross unrealized holding gains
Gross unrealized holding (losses) (144) (159)
Amortized cost basis [2] 13,774 24,205
Accrued interest on securities 77 173
Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Aggregate fair value [1] 7,749 16,293
Gross unrealized holding gains
Gross unrealized holding (losses) (49) (97)
Amortized cost basis [2] 7,798 16,390
Non Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Aggregate fair value [1] 5,881 7,753
Gross unrealized holding gains
Gross unrealized holding (losses) (95) (62)
Amortized cost basis [2] $ 5,976 $ 7,815
[1] Fair value is being determined using quoted market prices in active markets (Level 1).
[2] Including accrued interest in the amount of US$ 173 thousand and US$ 77 thousand as of December 31, 2016 and 2017 respectively. The accrued interest is presented as part of other account receivable on the balance sheet.