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Significant Accounting Policies - Acquired Unfavorable 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 Unfavorable Real Estate Leases and Amortization          
Number of acquisitions of properties with leases | item       3 1
Acquired unfavorable real estate leases          
Acquired Unfavorable Real Estate Leases and Amortization          
Amortization $ 1,300 $ 2,000 $ 3,100    
Estimated annual amortization for succeeding five years          
2020 920        
2021 597        
2022 323        
2023 218        
2024 144        
2025 and thereafter $ 310        
Acquired unfavorable real estate leases | Minimum          
Acquired Unfavorable Real Estate Leases and Amortization          
Term of lease 42 months        
Acquired unfavorable real estate leases | Maximum          
Acquired Unfavorable Real Estate Leases and Amortization          
Term of lease 176 months