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Available-For-Sale Marketable Securities (Available-For-Sale Marketable Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Schedule of Available-For-Sale Securities [Line Items]  
Amortized cost $ 49,329
Gross unrealized gains 786
Gross unrealized losses (4)
Available-for-sale securities Fair value 50,111
Government Debentures - Fixed And Floating Interest Rate [Member]
 
Schedule of Available-For-Sale Securities [Line Items]  
Amortized cost 12,428
Gross unrealized gains 192
Gross unrealized losses   
Available-for-sale securities Fair value 12,620
Corporate Debenture - Fix And Floating Interest Rate [Member]
 
Schedule of Available-For-Sale Securities [Line Items]  
Amortized cost 36,901
Gross unrealized gains 594
Gross unrealized losses (4)
Available-for-sale securities Fair value $ 37,441