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Marketable Securities (Held-To-Maturity Securities) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost basis [1] $ 38,301 $ 35,864
Gross unrealized holding gains 2  
Gross unrealized holding (losses) (357) $ (340)
Aggregate fair value [2] 37,946 35,524
Accrued interest on securities 315 339
Current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost basis [1] $ 8,705 $ 15,328
Gross unrealized holding gains    
Gross unrealized holding (losses) $ (118) $ (69)
Aggregate fair value [2] 8,587 15,259
Non-current [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost basis [1] 29,596 $ 20,536
Gross unrealized holding gains 2  
Gross unrealized holding (losses) (239) $ (271)
Aggregate fair value [2] $ 29,359 $ 20,265
[1] Including accrued interest in the amount of US$ 339 thousands and US$ 315 thousands as of December 31, 2014 and June 30, 2015 respectively.
[2] Fair value is being determined using quoted market prices in active markets (Level 1).