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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary of income from commercial rents included in real estate revenue:      
Base rent $ 5,613 $ 5,208 $ 4,934
Percentage rent 495 $ 652 $ 422
Future minimum rental income on commercial, communication and right-of-way leases:      
2016 5,330    
2017 5,063    
2018 4,996    
2019 5,006    
2020 4,708    
Thereafter $ 23,980    
Maximum      
Property Subject to or Available for Operating Lease [Line Items]      
Commercial lease agreements, contract terms 60 years