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Significant Accounting Policies - Acquired Real Estate Leases and Amortization (Details)
12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
item
Acquired real estate leases and amortization      
Number of acquisitions of properties with leases | item 1   3
Amortization expense $ (158,000) $ 635,000 $ (365,000)
Acquired in-place and above market real estate leases      
Acquired real estate leases and amortization      
Amortization expense 38,829,000 $ 44,701,000 $ 32,230,000
Estimated annual amortization for succeeding five years      
2016 32,302,000    
2017 25,233,000    
2018 19,624,000    
2019 12,887,000    
2020 7,659,000    
2021 and thereafter $ 10,341,000    
Acquired in-place and above market real estate leases | Minimum      
Acquired real estate leases and amortization      
Term of lease 3 months    
Acquired in-place and above market real estate leases | Maximum      
Acquired real estate leases and amortization      
Term of lease 281 months