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STOCKHOLDERS' EQUITY (Common and Preferred Stock) (Details)
 9 Months Ended
Sep. 30, 2019
vote
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Common Stock [Abstract]    
Maximum individual common stock ownership (in hundredths) 9.80%  
Preferred Stock    
Preferred Stock [Abstract]    
Preferred shares authorized (in shares) 8,990,000  
Convertible Series AA Preferred Stock    
Preferred Stock [Abstract]    
Preferred shares authorized (in shares) 1,000,000  
Annual cash dividend rate (in hundredths) 7.00%  
Liquidation preference per share (in dollars per share) | $ / shares $ 25.00  
Initial conversion price (in dollars per share) | $ / shares $ 25.00  
Total number of common shares issuable upon conversion of outstanding shares of preferred stock (in shares) 2  
Common Class A    
Common Stock [Abstract]    
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Par value (in dollars per share) | $ / shares $ 0.01 $ 0.01
Common stock shares issued (in shares) 17,690,378 17,721,422
Number of votes holder is entitled to | vote 1  
Common Class B    
Common Stock [Abstract]    
Common stock, shares authorized (in shares) 1,000  
Par value (in dollars per share) | $ / shares $ 0.01  
Common stock shares issued (in shares) 0  
Number of votes holder is entitled to | vote 1