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Marketable Securities (Held-To-Maturity Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost basis [1] $ 29,301 $ 33,138
Gross unrealized holding gains 27
Gross unrealized holding (losses) (104) (345)
Aggregate fair value [2] 29,224 32,793
Accrued interest on securities 155 256
Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost basis [1] 15,591 8,720
Gross unrealized holding gains 9
Gross unrealized holding (losses) (52) (90)
Aggregate fair value [2] 15,548 8,630
Non Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost basis [1] 13,710 24,418
Gross unrealized holding gains 18
Gross unrealized holding (losses) (52) (255)
Aggregate fair value [2] $ 13,676 $ 24,163
[1] Including accrued interest in the amount of US$ 256 thousands and US$ 155 thousands as of December 31, 2015 and June 30, 2016 respectively.
[2] Fair value is being determined using quoted market prices in active markets (Level 1).