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Common Stock Dividend (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 31, 2020
Jun. 10, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Common stock dividends                  
Quarterly dividends declared (in dollars per share)   $ 0.45              
Percentage of aggregate dividends declared payable in cash   50.00%              
Aggregate common stock cash and stock dividends paid $ 9,068,000                
Dividends paid in cash $ 4,537,000           $ 18,003,000 $ 17,555,000  
Dividends paid by the issuance of shares 263,229                
Stock distributions per share of common stock $ 17.22   $ 0.225       $ 0.225    
Common stock, shares issued     19,450,000       19,450,000   19,251,000
Common stock, shares outstanding     19,450,000       19,450,000   19,251,000
Cash dividend declared     $ 4,535,000 $ 9,036,000 $ 8,922,000 $ 8,832,000      
Including issuance of stock dividend                  
Common stock dividends                  
Common stock, shares issued     19,714,000       19,714,000    
Common stock, shares outstanding     19,714,000       19,714,000