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Summary of Significant Accounting Policies - Narrative (Details)
 3 Months Ended 6 Months Ended
Aug. 19, 2014
USD ($)
Jun. 30, 2015
USD ($)
interest_rate_contract
property
derivative
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
interest_rate_contract
property
derivative
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
interest_rate_contract
property
Property, Plant and Equipment            
Capitalized personnel costs   $ 1,900,000 $ 700,000 $ 2,800,000 $ 1,300,000  
Capitalized interest   $ 900,000 1,700,000 $ 3,000,000 3,300,000  
Period after which major construction is complete       1 year    
Impairment of Long-Lived Assets            
Number of properties held for sale | property   0   0   1
Asset impairment charges   $ 0 $ 0 $ 0 0  
Goodwill            
Goodwill   8,754,000   8,754,000   $ 8,754,000
Accounts Receivable and Allowance for Doubtful Accounts            
Allowance for doubtful accounts   1,304,000   1,304,000   1,040,000
Bad debt expense       391,000 $ 121,000  
Notes Receivable            
Notes receivable, maximum principal $ 140,000,000          
Notes receivable, share of maximum principal, percentage 23.77%          
Notes receivable, share of maximum principal, amount $ 33,300,000          
Notes receivable, gross   28,500,000   28,500,000    
Note receivable interest rate 11.00%          
Commitment fee earned $ 400,000          
Notes receivable   $ 28,476,000   28,476,000   $ 28,268,000
Income Taxes            
Income tax expense       $ 0    
Credit-Risk-Related Contingent Features            
Number of derivatives in a net liability position | derivative   1   1    
Cash Flow Hedging            
Derivative Financial Instruments            
Number of interest rate contracts | interest_rate_contract   7   7   3
Allowance For Straight-Line Receivables            
Accounts Receivable and Allowance for Doubtful Accounts            
Allowance for doubtful accounts   $ 600,000   $ 600,000   $ 600,000
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