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Derivative Financial Instruments (Notional Amounts Of Outstanding Foreign Exchange Forward Contracts) (Details) (Forward Contracts [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Derivative [Line Items]    
Notional amount of foreign currency derivative purchase contracts $ 496,288 $ 756,068
Notional amount of foreign currency derivative sale contracts 174,835 233,466
Euro
    
Derivative [Line Items]    
Notional amount of foreign currency derivative purchase contracts 60,665 57,022
Notional amount of foreign currency derivative sale contracts 131,696 154,251
GBP [Member]
    
Derivative [Line Items]    
Notional amount of foreign currency derivative purchase contracts 45,262 30,868
Notional amount of foreign currency derivative sale contracts 28,268 45,095
NIS [Member]
    
Derivative [Line Items]    
Notional amount of foreign currency derivative purchase contracts 386,017 654,105
Other Currency [Member]
    
Derivative [Line Items]    
Notional amount of foreign currency derivative purchase contracts 4,344 14,073
Notional amount of foreign currency derivative sale contracts $ 14,871 $ 34,120