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Earnings Per Share (Computations Of Basic And Diluted Earnings Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Earnings Per Share [Abstract]                      
Net income $ 61,353 $ 72,300 $ 81,683 $ 62,664 $ 57,473 $ 60,433 $ 50,657 $ 46,382 $ 278,000 $ 214,945 $ 178,981
Weighted average number of common shares outstanding                 31,513 31,217 31,234
Dilutive stock options and SOSARs                 254 497 422
Dilutive non-vested stock awards                 16 61 79
Diluted weighted-average number of common shares outstanding                 31,783 31,775 31,735
Basic earnings per share $ 1.96 $ 2.28 $ 2.58 $ 2.00 $ 1.84 $ 1.93 $ 1.63 $ 1.49 $ 8.82 $ 6.89 $ 5.73
Diluted earnings per share $ 1.95 $ 2.27 $ 2.56 $ 1.97 $ 1.81 $ 1.90 $ 1.59 $ 1.46 $ 8.75 $ 6.76 $ 5.64