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Preferred Stock (Details) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Preferred Stock [Member]    
Class of Stock [Line Items]    
Preferred Stock, Shares Authorized 5,000,000  
Preferred Class B [Member]    
Class of Stock [Line Items]    
Preferred Stock, Shares Authorized 60,000 60,000
Preferred Stock, Dividend Payment Rate, Variable 1000  
Preferred Stock, Voting Rights 1000  
Preferred Stock, Liquidation Preference Per Share $ 1,000