Quarterly report pursuant to Section 13 or 15(d)

Redeemable 5% Cumulative Preferred Stock (Details)

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Redeemable 5% Cumulative Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended
Dec. 31, 2013
Mar. 31, 2018
Dec. 31, 2017
Class of Stock [Line Items]      
Redeemable Cumulative Preferred Stock, shares outstanding   10,000 15,000
Redeemable Cumulative Preferred Stock, dividend rate   5.00% 5.00%
Redeemable Cumulative Preferred Stock, stated value per share   $ 1,000 $ 1,000
Cumulative Preferred Stock stated value   $ 0.01 $ 0.01
Number of preferred shares, loan secured by shares 5,000    
Holders Of The 5% Cumulative Preferred Stock [Member]      
Class of Stock [Line Items]      
Debt instrument term (in years)   5 years  
Redeemable 5% Cumulative Preferred Stock [Member]      
Class of Stock [Line Items]      
Loan issued to holders $ 5.0    
Shares redeemed   5,000