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Stock and Other Incentive Plans (Details) (Restricted Stock and Performance Based Awards [Member], USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Restricted Stock and Performance Based Awards [Member]
     
Summary of the activity under the incentive plans      
Stock-based awards, beginning of year 1,770,061 1,430,675 1,379,243
Granted 134,752 397,917 106,569
Vested (116,645) (58,531) (44,211)
Forfeited 0 0 (10,926)
Stock-based awards, end of year 1,788,168 1,770,061 1,430,675
Weighted-average grant date fair value of:      
Stock-based awards, beginning of year $ 23.97 $ 24.42 $ 24.71
Stock-based awards granted during the year $ 23.90 $ 22.35 $ 21.64
Stock-based awards vested during the year $ 26.35 $ 23.99 $ 26.33
Stock-based awards forfeited during the year $ 0.00 $ 0.00 $ 22.24
Stock-based awards, end of year $ 23.81 $ 23.97 $ 24.42
Grant date fair value of shares granted during the year $ 3,220,623 $ 8,894,424 $ 2,305,848