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Series A Notes, Net Of Current Maturities (Schedule Of Series A Notes, Net Of Current Maturities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Series A Notes, Net Of Current Maturities [Abstract]    
Series A Notes $ 259,094  
Less - Current maturities (29,612)  
Carrying amount adjustments on Series A Notes 7,412 [1]  
Discount on Series A Notes (1,575)  
Series A Notes, net of current maturities $ 235,319 $ 273,357
[1] As a result of fair value hedge accounting, described below, and in Notes 2(Y) and 2(AA). The carrying value of the Series A Notes is adjusted for changes in the interest rates.