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Stock and Other Incentive Plans (Details) (Restricted Stock and Performance Based Awards [Member], USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Restricted Stock and Performance Based Awards [Member]
     
Summary of the activity under the incentive plans      
Stock-based awards, beginning of year 1,430,675 1,379,243 1,224,779
Granted 397,917 106,569 175,412
Vested (58,531) (44,211) (20,948)
Forfeited 0 (10,926) 0
Stock-based awards, end of year 1,770,061 1,430,675 1,379,243
Weighted-average grant date fair value of:      
Stock-based awards, beginning of year $ 24.65 $ 24.71 $ 25.16
Stock-based awards granted during the year $ 22.35 $ 21.64 $ 21.19
Stock-based awards vested during the year $ 20.97 $ 20.13 $ 22.60
Stock-based awards forfeited during the year $ 0.00 $ 21.00 $ 0.00
Stock-based awards, end of year $ 24.23 $ 24.65 $ 24.71
Grant date fair value of shares granted during the year $ 8,894,424 $ 2,305,848 $ 3,600,160