Quarterly report pursuant to Section 13 or 15(d)

Common Stock And Redeemable 5% Cumulative Preferred Stock (Details)

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Common Stock And Redeemable 5% Cumulative Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Apr. 19, 2018
Apr. 30, 2018
Dec. 31, 2013
Jun. 30, 2018
Dec. 31, 2017
Class of Stock [Line Items]          
Purchase and retirement of BFC's Class A Common Stock       $ 60,124  
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
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  
Class A Common Stock [Member]          
Class of Stock [Line Items]          
Purchase and retirement, shares   6,486,486      
Share repurchased and retired, price per share   $ 9.25      
Purchase and retirement of BFC's Class A Common Stock   $ 60,100      
Shares purchased in tender offer percent of total, number of class A 7.60%        
Class B Common Stock [Member]          
Class of Stock [Line Items]          
Shares Purchased In Tender Offer Percent Of Total Issued And Outstanding Equity 6.30%        
Redeemable 5% Cumulative Preferred Stock [Member]          
Class of Stock [Line Items]          
Loan issued to holders     $ 5,000    
Shares redeemed       5,000