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Significant Accounting Policies (Details 3) (USD $)
12 Months Ended
Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Acquired real estate leases and amortization      
Number of acquisitions of properties with leases 3 2 5
Amortization expense $ (365,000) $ 71,000 $ (47,000)
Acquired in-place and above market real estate leases
     
Acquired real estate leases and amortization      
Amortization expense 32,230,000 19,174,000 13,697,000
Estimated annual amortization for succeeding five years      
2014 42,243,000    
2015 36,876,000    
2016 30,807,000    
2017 24,524,000    
2018 19,369,000    
2019 and thereafter $ 29,635,000    
Acquired in-place and above market real estate leases | Minimum
     
Acquired real estate leases and amortization      
Term of lease 1 month    
Acquired in-place and above market real estate leases | Maximum
     
Acquired real estate leases and amortization      
Term of lease 281 months