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Shareholders' Equity and Stock-Based Compensation (Details 2) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended
Dec. 18, 2013
Jan. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary of common shares issued, treasury shares and shares outstanding          
Balance at the beginning of the period (in shares)   48,303,707 48,303,707 51,073,000 50,294,000
Stock options exercised (in shares)     8,000 174,000 154,000
Share repurchases (in shares)     (3,493,000) (3,606,000)  
Restricted stock shares and restricted stock units (in shares)     256,000 396,000 354,000
Other (in shares)     206,000 267,000 271,000
Balance at the end of the period (in shares)     45,281,329 48,303,707 51,073,000
Common Stock
          
Authorized shares     200,000,000    
Par value (in dollars per share)     $ 10.00    
Summary of common shares issued, treasury shares and shares outstanding          
Balance at the beginning of the period (in shares)   99,454,000 99,454,000 98,702,000 98,068,000
Stock options exercised (in shares)     8,000 174,000 154,000
Restricted stock shares and restricted stock units (in shares)     133,000 311,000 209,000
Other (in shares)     206,000 267,000 271,000
Balance at the end of the period (in shares)     99,801,000 99,454,000 98,702,000
Common Stock In Treasury
          
Summary of common shares issued, treasury shares and shares outstanding          
Balance at the beginning of the period (in shares)   (51,150,000) (51,150,000) (47,629,000) (47,774,000)
Share repurchases (in shares) (115,000) (1,514,000) (3,493,000) (3,606,000)  
Restricted stock shares and restricted stock units (in shares)     123,000 85,000 145,000
Balance at the end of the period (in shares)     (54,520,000) (51,150,000) (47,629,000)