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Capital Stock (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
May. 12, 2015
Dec. 31, 2014
Capital Unit [Line Items]        
Common Stock, shares authorized (shares) 180,000,000 180,000,000    
Common stock, par value (dollars per share) $ 0 $ 0   $ 0
Common stock, shares, outstanding (shares) 37,349,911 37,349,911   37,448,310
Treasury stock, shares acquired 150,000      
Treasury stock, shares 24,731,480 24,731,480   24,633,081
Second Cumulative Preferred Voting Stock        
Capital Unit [Line Items]        
Preferred stock, shares authorized 1,000,000 1,000,000    
Preferred stock, par value (dollars per share) $ 10 $ 10    
Preferred stock, shares issued (shares) 0 0    
Treasury Stock        
Capital Unit [Line Items]        
Reissued shares   117,529    
Board of Directors        
Capital Unit [Line Items]        
Common stock, value, issued     $ 100,000,000  
4 1/2% Cumulative Preferred Nonvoting Stock        
Capital Unit [Line Items]        
Preferred stock, shares authorized 100,000 100,000    
Preferred stock, par value (dollars per share) $ 50 $ 50    
Percentage of cumulative preferred stock 4.50% 4.50%    
Preferred stock, callable price per share (dollars per share) $ 52.50 $ 52.50    
Preferred stock, shares issued (shares) 71,373 71,373    
Treasury share, number of shares held (shares) 52,878 52,878    
Purchase of treasury shares $ 0