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Significant Accounting Policies - Acquired Real Estate Leases and Amortization (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
item
Dec. 31, 2015
item
Acquired real estate leases and amortization          
Number of acquisitions of properties with leases | item       3 1
Acquired in-place and above market real estate leases          
Acquired real estate leases and amortization          
Amortization expense $ 18,900 $ 26,900 $ 39,000    
Estimated annual amortization for succeeding five years          
2020 12,494        
2021 9,000        
2022 5,420        
2023 4,288        
2024 3,539        
2025 and thereafter $ 5,963        
Acquired in-place and above market real estate leases | Minimum          
Acquired real estate leases and amortization          
Term of lease 40 months        
Acquired in-place and above market real estate leases | Maximum          
Acquired real estate leases and amortization          
Term of lease 176 months