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Share-Based Compensation (Summary Of Share Incentive Plans) (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding Options, Number 1,339,536 1,847,136 1,983,358
Granted, Options Outstanding 0 0 55,895
Exercised/Vested, Options Outstanding 468,839 504,838 141,213
Forfeited, Options Outstanding 31,943 2,762 50,904
Net activity, Options Outstanding 500,782 507,600 136,222
Outstanding Options, Number 838,754 [1] 1,339,536 1,847,136
Weighted Average Exercise/Grant Price, balance $ 42.27 $ 42.37 $ 41.39
Granted, Weighted Average Exercise/Grant Price $ 0.00 $ 0.00 $ 43.94
Exercised/Vested, Weighted Average Exercise/Grant Price $ 40.86 $ 42.59 $ 32.54
Forfeited, Weighted Average Exercise/Grant Price $ 60.56 $ 48.02 $ 46.65
Weighted Average Exercise/Grant Price, balance $ 42.36 [1] $ 42.27 $ 42.37
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]      
Nonvested share awards outstanding, Share Awards Outstanding 818,754 741,505 595,153
Granted, Share Awards Outstanding 346,330 347,084 372,661
Exercised/Vested, Share Awards Outstanding 282,552 243,874 214,923
Forfeited, Share Awards Outstanding 20,279 25,961 11,386
Net activity, Nonvested Share Awards Outstanding 43,499 77,249 146,352
Nonvested share awards outstanding, Share Awards Outstanding 862,253 818,754 741,505
Nonvested share awards outstanding, Weighted Average Exercise/Grant Price $ 46.88 $ 42.16 $ 46.20
Granted, Weighted Average Exercise/Grant Price $ 63.51 $ 57.00 $ 40.05
Exercised/Vested, Weighted Average Exercise/Grant Price $ 49.28 $ 47.19 $ 49.17
Forfeited, Weighted Average Exercise/Grant Price $ 52.05 $ 44.51 $ 39.64
Nonvested share awards outstanding, Weighted Average Exercise/Grant Price $ 52.64 $ 46.88 $ 42.16
[1] (1)The aggregate intrinsic value of outstanding and exercisable options at December 31, 2012 was approximately $21.8 million and $12.4 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $68.21 per share on December 31, 2012 and the strike price of the underlying award.