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Fair Value Measurements (Schedule Of Income Tax Benefit) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Fair Value Measurements [Abstract]    
Foreign currency translation adjustments and other $ (730) $ 2,234
Unrealized holding gain on marketable securities 2,820 7,017
Unrealized holding gain on cash flow derivatives 8,774 5,120
Income tax benefit $ 10,864 $ 14,371