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Marketable Securities (Held-To-Maturity Securities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost basis [1] $ 33,138 $ 35,864
Gross unrealized holding gains
Gross unrealized holding (losses) $ (345) $ (340)
Aggregate fair value [2] 32,793 35,524
Accrued interest on securities 256 339
Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost basis [1] $ 8,720 $ 15,328
Gross unrealized holding gains
Gross unrealized holding (losses) $ (90) $ (69)
Aggregate fair value [2] 8,630 15,259
Non Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost basis [1] $ 24,418 $ 20,536
Gross unrealized holding gains
Gross unrealized holding (losses) $ (255) $ (271)
Aggregate fair value [2] $ 24,163 $ 20,265
[1] Including accrued interest in the amount of US$ 339 thousand and US$ 256 thousand as of December 31, 2014 and 2015 respectively.
[2] Fair value is being determined using quoted market prices in active markets (Level 1).