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Summary of Significant Accounting Policies - Narrative (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
derivative
indicator
subsidiary
Sep. 30, 2013
indicator
Sep. 30, 2014
derivative
indicator
subsidiary
property
Sep. 30, 2013
indicator
Dec. 31, 2013
property
Property, Plant and Equipment          
Capitalized personnel costs $ 800,000 $ 500,000 $ 2,100,000 $ 1,500,000  
Capitalized interest 1,900,000 1,100,000 5,200,000 2,800,000  
Construction costs capitalization period after substantially complete     1 year    
Impairment of Long-Lived Assets          
Number of properties held for sale         0
Goodwill          
Goodwill 8,754,000   8,754,000   8,754,000
Goodwill Impairment Indicators 0 0 0 0  
Accounts Receivable and Allowance for Doubtful Accounts          
Allowance for doubtful accounts 766,000   766,000   1,243,000
Bad debt expense     (326,000) 176,000  
Income Taxes          
Income tax expense     0 0  
Number of subsidiaries 1   1    
Credit-Risk-Related Contingent Features          
Number of derivatives in a net liability position 1   1    
Asset Impairment Charges 0 145,000 0 5,580,000  
Cash Flow Hedging
         
Derivative Financial Instruments          
Number of interest rate contracts 3   3   3
Allowance For Straight-Line Receivables
         
Accounts Receivable and Allowance for Doubtful Accounts          
Allowance for doubtful accounts $ 516,000   $ 516,000   $ 328,000
Building Improvements
         
Property, Plant and Equipment          
Estimated useful life     39 years    
Land Improvements
         
Property, Plant and Equipment          
Estimated useful life     15 years    
Furniture And Fixtures | Minimum
         
Property, Plant and Equipment          
Estimated useful life     5 years    
Furniture And Fixtures | Maximum
         
Property, Plant and Equipment          
Estimated useful life     7 years