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Real Estate (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Real Estate Properties [Line Items]    
Total revenues $ 42,485,000 $ 36,883,000
Impairment charges 7,474,000  
Contract Termination [Member]    
Real Estate Properties [Line Items]    
Impairment charges 7,500,000  
Contract Termination [Member] | Other Income [Member]    
Real Estate Properties [Line Items]    
Total revenues $ 7,100,000