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Marketable Securities (Held-To-Maturity Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Aggregate fair value [1] $ 24,046 $ 32,793
Gross unrealized holding gains
Gross unrealized holding (losses) (159) (345)
Amortized cost basis [2] 24,205 33,138
Accrued interest on securities 173 256
Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Aggregate fair value [1] 16,293 8,630
Gross unrealized holding gains
Gross unrealized holding (losses) (97) (90)
Amortized cost basis [2] 16,390 8,720
Non Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Aggregate fair value [1] 7,753 24,163
Gross unrealized holding gains
Gross unrealized holding (losses) (62) (255)
Amortized cost basis [2] $ 7,815 $ 24,418
[1] Fair value is being determined using quoted market prices in active markets (Level 1).
[2] Including accrued interest in the amount of US$ 256 thousand and US$ 173 thousand as of December 31, 2015 and 2016 respectively. The accrued interest is presented as part of other account receivable on the balance sheet.