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Marketable Securities (Held-To-Maturity Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Held-to-maturity Securities [Line Items]    
Aggregate fair value [1] $ 13,526 $ 24,046
Gross unrealized holding gains
Gross unrealized holding (losses) (66) (159)
Amortized cost basis [2] 13,592 24,205
Accrued interest on securities 115 173
Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Aggregate fair value [1] 13,526 16,293
Gross unrealized holding gains
Gross unrealized holding (losses) (66) (97)
Amortized cost basis [2] $ 13,592 16,390
Non Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Aggregate fair value [1]   7,753
Gross unrealized holding gains  
Gross unrealized holding (losses)   (62)
Amortized cost basis [2]   $ 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 thousands and US$ 115 thousands as of December 31, 2016 and June 30, 2017 respectively.