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Leases (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of income from commercial rents included in real estate revenue:      
Base rent $ 4,934us-gaap_OperatingLeasesIncomeStatementMinimumLeaseRevenue $ 4,929us-gaap_OperatingLeasesIncomeStatementMinimumLeaseRevenue $ 4,861us-gaap_OperatingLeasesIncomeStatementMinimumLeaseRevenue
Percentage rent 422us-gaap_PercentageRent 1,213us-gaap_PercentageRent 707us-gaap_PercentageRent
Future minimum rental income on commercial, communication and right-of-way leases:      
2014 5us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableCurrent    
2015 5us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInTwoYears    
2016 5us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInThreeYears    
2017 5us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFourYears    
2018 5us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableInFiveYears    
Thereafter 51us-gaap_OperatingLeasesFutureMinimumPaymentsReceivableThereafter    
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 7,942us-gaap_PropertySubjectToOrAvailableForOperatingLeaseGross
/ us-gaap_MajorPropertyClassAxis
= us-gaap_BuildingAndBuildingImprovementsMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember
   
Accumulated Depreciation $ 4,598us-gaap_PropertySubjectToOrAvailableForOperatingLeaseNet
/ us-gaap_MajorPropertyClassAxis
= us-gaap_BuildingAndBuildingImprovementsMember
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember