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Shareholders' Equity (Computation Of Basic And Diluted Net Earnings Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Shareholders' Equity [Abstract]      
Basic net earnings $ 90,288 $ 183,498 $ 214,947
Weighted average number of shares, basic net earnings 42,764 [1] 42,645 [1] 42,305 [1]
Basic net earnings per share $ 2.11 $ 4.30 $ 5.08
Employee stock options, Per Share amount 367 [1] 572 [1] 678 [1]
Weighted average number of shares, diluted net earnings 43,131 [1] 43,217 [1] 42,983 [1]
Diluted net earnings per share $ 2.09 $ 4.25 $ 5.00
[1] In thousands