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Shareholders' Equity (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stockholders' Equity Note [Abstract]      
Number of shares authorized for issue (in shares) 61,000,000    
Common Stock, authorized (in shares) 60,000,000 60,000,000 60,000,000
Common Stock, par value (in dollars per share) $ 0.375 $ 0.375  
Preferred Stock, authorized (in shares) 1,000,000 1,000,000  
Preferred Stock, par value (in dollars per share) $ 0.02 $ 0.02  
Class of Warrant or Right      
Preferred Share purchase rights expiration date Dec. 26, 2016    
Purchase Rights
      
Class of Warrant or Right      
Preferred Share purchase right dividend declared per common share outstanding (in shares) 1.00    
Exercise price per each Series A Junior Participating Preferred Stock (in dollars per share) $ 100    
Number of Series A Junior Participating Preferred shares the Rights holder is entitled to purchase (in shares) 0.01    
Maximum threshold of common stock ownership 20.00%    
Redemption price per right $ 0.001    
Minimum threshold of common stock ownership 10.00%