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Equity (Details 1) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Class of Stock [Line Items]    
Dividend Per Share $ 0.225 $ 0.225
Series 2012-A Preferred Stock (''Preferred Stock'') [Member] | January 16, 2018 [Member]    
Class of Stock [Line Items]    
Declaration Date Jan. 16, 2018  
Dividend Per Share $ 0.1594  
Aggregate Dividend Amount $ 370  
Record Date Feb. 06, 2018  
Payment Date Feb. 15, 2018  
Series 2012-A Preferred Stock (''Preferred Stock'') [Member] | April 16, 2018 [Member]    
Class of Stock [Line Items]    
Declaration Date Apr. 16, 2018  
Dividend Per Share $ 0.1594  
Aggregate Dividend Amount $ 370  
Record Date May 07, 2018  
Payment Date May 15, 2018  
Series 2012-A Preferred Stock (''Preferred Stock'') [Member] | July 25, 2018 [Member]    
Class of Stock [Line Items]    
Declaration Date Jul. 25, 2018  
Dividend Per Share $ 0.1594  
Aggregate Dividend Amount $ 370  
Record Date Aug. 08, 2018  
Payment Date Aug. 15, 2018  
Class A Common Stock and Class B Common Stock [Member] | March 7, 2018 [Member]    
Class of Stock [Line Items]    
Declaration Date Mar. 07, 2018  
Dividend Per Share $ 0.0750  
Aggregate Dividend Amount $ 1,865  
Record Date Mar. 19, 2018  
Payment Date Mar. 23, 2018  
Class A Common Stock and Class B Common Stock [Member] | May 2, 2018 [Member]    
Class of Stock [Line Items]    
Declaration Date May 02, 2018  
Dividend Per Share $ 0.0750  
Aggregate Dividend Amount $ 1,877  
Record Date May 15, 2018  
Payment Date May 23, 2018  
Class A Common Stock and Class B Common Stock [Member] | July 31, 2018 [Member]    
Class of Stock [Line Items]    
Declaration Date Jul. 31, 2018  
Dividend Per Share $ 0.0750  
Aggregate Dividend Amount $ 2,017  
Record Date Aug. 15, 2018  
Payment Date Aug. 24, 2018