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Preferred Stocks (Details) - USD ($)
12 Months Ended
Apr. 01, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]        
Payments for repurchase of redeemable preferred stock $ 15,600,000      
Redeemable preferred stock classified as long term debt $ 300,000      
Preferred stock with par value        
Class of Stock [Line Items]        
Preferred stock, shares authorized     500,000  
Preferred stock, par value per share     $ 100  
Preferred stock A without par value        
Class of Stock [Line Items]        
Preferred stock, shares authorized     1,000,000  
Preferred stock, par value per share     $ 0  
Preference Stock without par value        
Class of Stock [Line Items]        
Preferred stock, shares authorized     500,000  
Preferred stock, par value per share     $ 0  
Preferred stock        
Class of Stock [Line Items]        
Preferred stock, shares oustanding     0 0
Preferred stock, series 4.50%        
Class of Stock [Line Items]        
Preferred stock, dividend rate, percentage 4.50% 4.50%    
Preferred stock, dividends per share, declared   $ 4.50    
Preferred stock, redemption price per share $ 105      
Preferred stock, series 4.70%        
Class of Stock [Line Items]        
Preferred stock, dividend rate, percentage 4.70% 4.70%    
Preferred stock, dividends per share, declared   $ 4.70    
Preferred stock, redemption price per share $ 102