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Marketable Securities (Held-To-Maturity Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost $ 39,632 [1] $ 41,477 [1]
Gross unrealized holding gains 89 216
Gross unrealized holding (losses) (243) (182)
Aggregate fair value 39,478 [2] 41,511 [2]
Accrued interest on securities 391 425
Current [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 15,015 [1] 12,702 [1]
Gross unrealized holding gains 20 23
Gross unrealized holding (losses) (76) (56)
Aggregate fair value 14,959 [2] 12,669 [2]
Non Current [Member]
    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 24,617 [1] 28,775 [1]
Gross unrealized holding gains 69 193
Gross unrealized holding (losses) (167) (126)
Aggregate fair value $ 24,519 [2] $ 28,842 [2]
[1] Including accrued interest in the amount of $425K and $391K as of December 31, 2012 and 2013 respectively.
[2] Fair value is being determined using quoted market prices in active markets (Level 1).