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Benefit Plans And Obligations For Termination Indemnity (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Benefit Plans And Obligations For Termination Indemnity [Abstract]      
Defined benefit plans, general information    
Expected benefit payments, 2012 $ 3,470    
Expected benefit payments, 2013 4,085    
Expected benefit payments, 2014 4,620    
Expected benefit payments, 2015 5,216    
Expected benefit payments, 2016 5,833    
Total expense 4,436 3,896 3,577
Salary and bonus defer percentage under the plan 100.00%    
ESA offers, maximum percentage 10.00%    
Participant contributions transferred into the plan 441    
ESA contribution to the plan 100    
Cash surrender value of the life insurance policies 3,566    
Total liability 3,401    
Plan assets of life insurance policies, cash surrender 1,861    
Related liability, pension payments $ 2,731