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Leases (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of income from commercial rents included in real estate revenue:      
Base rent $ 4,861,000 $ 4,620,000 $ 4,494,000
Percentage rent 707,000 310,000 443,000
Future minimum rental income on commercial, communication and right-of-way leases:      
2013 4,423,000    
2014 4,324,000    
2015 4,106,000    
2016 3,969,000    
2017 3,979,000    
Thereafter 26,228,000    
Maximum [Member]
     
Property Subject to or Available for Operating Lease [Line Items]      
Commercial lease agreements, contract terms 60 years    
Building and improvements [Member] | Properties subject to lease agreements [Member]
     
Property Subject to or Available for Operating Lease [Line Items]      
Cost 7,942,000    
Accumulated Depreciation $ 4,012,000