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Retirement and Share-based Compensation Plans (Changes in the Number of Stock Options Outstanding) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Outstanding, number of shares 3,976,725 5,732,450 4,844,850 4,120,850
Outstanding, weighted-average exercise price per share $ 10.86 $ 10.35 $ 10.13 $ 8.78
Outstanding, total exercise price $ 43,171 $ 59,321 $ 49,097 $ 36,187
Granted, number of shares 1,210,950 1,558,900 1,486,850  
Granted, weighted-average exercise price per share $ 13.13 $ 10.40 $ 12.99  
Granted, total exercise price 15,899 16,216 19,309  
Canceled, number of shares (29,400) (28,050) (177,500)  
Canceled, weighted-average exercise price per share $ 9.96 $ 8.97 $ 9.66  
Canceled, total exercise price (293) (251) (1,714)  
Exercised, number of shares (2,937,275) (643,250) (585,350)  
Exercised, weighted-average exercise price per share $ 10.81 $ 8.93 $ 8.00  
Exercised, total exercise price $ (31,756) $ (5,741) $ (4,685)