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Revenue Recognition (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Minimum Lease Payments:      
2021 $ 142,003    
2022 124,714    
2023 110,543    
2024 95,002    
2025 77,835    
Thereafter 263,438    
Total 813,535    
Disaggregation of Revenue [Line Items]      
Receivables 327 $ 460  
Property management fee      
Disaggregation of Revenue [Line Items]      
Income 2,093 2,421 $ 2,626
Asset management fee      
Disaggregation of Revenue [Line Items]      
Income 1,098 1,074 1,080
Leasing commissions and other fees      
Disaggregation of Revenue [Line Items]      
Income 456 361 684
Other fee income      
Disaggregation of Revenue [Line Items]      
Income $ 3,647 $ 3,856 $ 4,390
Minimum      
Disaggregation of Revenue [Line Items]      
Remaining lease term 1 year    
Maximum      
Disaggregation of Revenue [Line Items]      
Remaining lease term 78 years