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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Stockholders' Equity Note [Abstract]      
Basic net earnings $ 183,417 $ 167,879 $ 90,288
Weighted average number of shares, basic net earnings 42,139 [1] 42,190 42,764 [1]
Basic net earnings per share $ 4.35 $ 3.98 $ 2.11
Employee stock options, Per Share amount 156 [1] 87 367 [1]
Weighted average number of shares, diluted net earnings 42,295 [1] 42,277 43,131 [1]
Diluted net earnings per share $ 4.34 $ 3.97 $ 2.09
[1] In thousands