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Stock and Other Incentive Plans (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Weighted-average grant date fair value of:      
Stock-based awards, beginning of year $ 24.71 $ 25.16 $ 25.71
Stock-based awards granted during the year $ 21.64 $ 21.19 $ 21.01
Stock-based awards vested during the year $ 20.13 $ 22.60 $ 32.80
Stock-based awards forfeited during the year $ 21.00 $ 0 $ 0
Stock-based awards, end of year $ 24.65 $ 24.71 $ 25.16
Grant date fair value of shares granted during the year $ 2,305,848 $ 3,600,160 $ 2,617,678
Restricted Stock All [Member]
     
Summary of the activity under the incentive plans      
Stock-based awards, beginning of period 1,379,243 1,224,779 1,111,728
Granted 106,569 175,412 124,587
Vested (44,211) (20,948) (11,536)
Forfeited (10,926)    
Stock-based awards, end of period 1,430,675 1,379,243 1,224,779