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Shareholders' Equity (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Purchase Rights [Member]
Shareholders' Equity [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 [Line Items]        
Preferred Share Purchase Right dividend declared per common share outstanding (in shares)       1
Number of Series A Junior Participating Preferred shares the Rights holder is entitled to purchase (in shares)       0.01
Exercise price per each Series A Junior Participating Preferred Stock (in dollars per share)       $ 100
Redemption price per right (in dollars per share)       $ 0.001
Maximum threshold of common stock ownership, for the entity to redeem rights at the stated price (in hundredths)       20.00%
Minimum threshold of common stock ownership, for the entity to redeem rights at the stated price (in hundredths)       10.00%