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Real Estate Investments - Base Rents (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Depreciation      
Depreciation expense $ 38,945 $ 39,094 $ 37,416
Future minimum base rents receivable      
2021 139,053    
2022 129,864    
2023 130,477    
2024 129,407    
2025 116,296    
Thereafter $ 507,352