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Equity Compensation, Employment Agreements and Other Benefit Plans (Deferred Compensation Plans) (Details) - Deferred Compensation Plans - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Deferrable compensation by the employee, maximum   100.00%    
Expenses related to Deferred Plans   $ (911,000) $ 663,000 $ (165,000)
Cash distributed to the participants $ 123,700 769,400 568,900  
Undistributed Income Deferred   2,197,000 2,349,000  
Liability Under Deferred Plans   1,809,000 3,071,000  
Non-employee directors        
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Expenses related to Deferred Plans   (911,000) 663,000 $ (165,000)
Undistributed Income Deferred   2,197,000 2,349,000  
Liability Under Deferred Plans   $ 1,809,000 $ 3,071,000