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Leases (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Summary of income from commercial rents included in real estate revenue:      
Base rent $ 4,929 $ 4,861 $ 4,620
Percentage rent 1,213 707 310
Future minimum rental income on commercial, communication and right-of-way leases:      
2013 4,664    
2014 4,246    
2015 4,107    
2016 4,118    
2017 3,932    
Thereafter 23,229    
Maximum
     
Property Subject to or Available for Operating Lease [Line Items]      
Commercial lease agreements, contract terms 60 years    
Building and improvements | Properties subject to lease agreements
     
Property Subject to or Available for Operating Lease [Line Items]      
Cost 7,942    
Accumulated Depreciation $ 4,303