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Significant Accounting Policies (Details 4) (USD $)
 12 Months Ended
Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Acquired Unfavorable Real Estate Leases and Amortization      
Number of acquisitions of properties with leases 2 5 1
Acquired unfavorable real estate leases
      
Acquired Unfavorable Real Estate Leases and Amortization      
Minimum term of lease 12 months    
Maximum term of lease 281 months    
Amortization 1,548,000 1,301,000 1,147,000
Estimated annual amortization for succeeding five years      
2013 1,863,000    
2014 1,722,000    
2015 1,614,000    
2016 1,136,000    
2017 801,000    
2018 and thereafter 1,174,000