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Revenue Recognition (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leases, Future Minimum Payments Receivable [Abstract]      
2019 $ 151,874    
2020 139,290    
2021 124,366    
2022 103,204    
2023 83,744    
Thereafter 282,629    
Total 885,107    
Disaggregation of Revenue [Line Items]      
Receivables $ 778 $ 515 $ 513
Affiliated Entity      
Disaggregation of Revenue [Line Items]      
Unconsolidated entity, ownership percentage 55.00%    
Property management fee      
Disaggregation of Revenue [Line Items]      
Income $ 2,626 2,794 2,701
Asset management fee      
Disaggregation of Revenue [Line Items]      
Income 1,080 1,213 1,213
Leasing commissions and other fees      
Disaggregation of Revenue [Line Items]      
Income 684 215 434
Other fee income      
Disaggregation of Revenue [Line Items]      
Income $ 4,390 $ 4,222 $ 4,348
Minimum      
Disaggregation of Revenue [Line Items]      
Remaining lease term 1 year    
Maximum      
Disaggregation of Revenue [Line Items]      
Remaining lease term 41 years