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Marketable Securities (Held-To-Maturity Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]    
Aggregate fair value [1] $ 46,862 $ 13,630
Gross unrealized holding gains
Gross unrealized holding (losses) (800) (144)
Amortized cost basis [2] 47,662 13,774
Accrued interest on securities 450 77
Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Aggregate fair value [1] 1,588 7,749
Gross unrealized holding gains
Gross unrealized holding (losses) (22) (49)
Amortized cost basis [2] 1,610 7,798
Non Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Aggregate fair value [1] 45,274 5,881
Gross unrealized holding gains
Gross unrealized holding (losses) (778) (95)
Amortized cost basis [2] $ 46,052 $ 5,976
[1] Fair value is being determined using quoted market prices in active markets (Level 2).
[2] Including accrued interest in the amount of US$ 77 thousand and US$ 450 thousand as of December 31, 2017 and 2018 respectively.