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Principal Activity and Significant Accounting Policies - Revenue recognition (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue Recognition      
Decrease/Increase in revenue due to straight - line adjustment $ (44) $ 99 $ 246
Straight - line receivable 3,331 $ 3,374  
Lease income:      
Lease income related to fixed lease payments 111,508    
Lease income related to variable lease payments 6,077    
Other (1,110)    
Lease income 116,475    
Rental income accounted for under revenue recognition standard:      
Other rental income 3,864    
Future minimum rental income:      
2020 17,956    
2021 14,979    
2022 11,595    
2023 9,663    
2024 9,244    
Thereafter 43,453    
Total $ 106,890    
Residential      
Revenue Recognition      
Percentage of revenue from leases that are generally for terms of one year or less 79.00%    
Lease income:      
Lease income related to fixed lease payments $ 91,930    
Other (934)    
Lease income $ 90,996    
Commercial      
Revenue Recognition      
Percentage of revenue from leases primarily under long-term lease agreements 21.00%    
Lease income:      
Lease income related to fixed lease payments $ 19,578    
Lease income related to variable lease payments 6,077    
Other (176)    
Lease income $ 25,479