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Retirement and Share-based Compensation Plans (Schedule of Stock Options Outstanding, By Exercise Price Range) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Exercise Price Range I [Member]
Dec. 31, 2013
Exercise Price Range II [Member]
Dec. 31, 2013
Exercise Price Range III [Member]
Dec. 31, 2013
Exercise Price Range, All Options [Member]
Dec. 31, 2013
Stock Options Outstanding [Member]
Exercise Price Range I [Member]
Dec. 31, 2013
Stock Options Outstanding [Member]
Exercise Price Range II [Member]
Dec. 31, 2013
Stock Options Outstanding [Member]
Exercise Price Range III [Member]
Dec. 31, 2013
Stock Options Outstanding [Member]
Exercise Price Range, All Options [Member]
Dec. 31, 2013
Stock Options Vested [Member]
Exercise Price Range I [Member]
Dec. 31, 2013
Stock Options Vested [Member]
Exercise Price Range II [Member]
Dec. 31, 2013
Stock Options Vested [Member]
Exercise Price Range III [Member]
Dec. 31, 2013
Stock Options Vested [Member]
Exercise Price Range, All Options [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]                                
Exercise price range, lower range limit         $ 5.07 $ 9.27 $ 11.87 $ 5.07                
Exercise price range, upper range limit         $ 9.16 $ 11.35 $ 14.62 $ 14.62                
Number of awards                 756,550 1,681,475 1,538,700 3,976,725 756,550 1,592,475 1,433,700 3,782,725
Remaining life (yrs)                 3 years 2 months 3 days 5 years 15 days 5 years 3 months 16 days 4 years 9 months 12 days 3 years 2 months 3 days 4 years 10 months 6 days 5 years 1 month 9 days 4 years 7 months 11 days
Weighted-average exercise price per share $ 10.86 $ 10.35 $ 10.13 $ 8.78         $ 7.48 $ 10.33 $ 13.10 $ 10.86 $ 7.48 $ 10.31 $ 13.16 $ 10.83