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Comprehensive Earnings (Components Of Other Comprehensive Earnings) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Comprehensive Earnings [Abstract]    
Unrecognized gain (loss) and prior service cost arising during the period      
Less: Amortization of prior service cost (gain) included in net earnings 10 (9)
Net change in unrecognized (loss) gain and prior service cost related to post-retirement plans (10) 9
Amount of gain recognized in AOCE on derivatives (effective portion) 17,017 3,613
Less: Reclassification of loss from AOCE into earnings (effective portion) (5,629) (1,037)
Net unrecognized gain on derivatives 22,646 4,650
Unrealized loss on marketable securities (143) (369)
Less: Reclassification for gain (loss) included in net earnings 25 (1)
Net unrealized loss on marketable securities $ (168) $ (368)