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Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Aug. 19, 2014
USD ($)
Dec. 31, 2015
USD ($)
interest_rate_contract
indicator
property
Dec. 31, 2014
USD ($)
interest_rate_contract
indicator
property
Dec. 31, 2013
USD ($)
Accounting Policies [Line Items]        
Capitalized personnel costs   $ 7,300,000 $ 3,100,000  
Capitalized interest   $ 6,500,000 $ 6,900,000  
Construction costs capitalization period after substantially complete   1 year    
Impairment of Long-Lived Assets        
Number of properties held for sale | property   1 1  
Goodwill        
Goodwill   $ 8,754,000 $ 8,754,000  
Goodwill impairment indicators noted | indicator   0 0  
Accounts Receivable and Allowance for Doubtful Accounts        
Allowance for doubtful accounts   $ 1,021,000 $ 1,040,000  
Bad debt expense   170,000 (97,000) $ 959,000
Notes Receivable        
Notes receivable, maximum principal $ 140,000,000.0      
Notes receivable, share of maximum principal, percentage 23.77%      
Notes receivable, share of maximum principal, amount $ 33,300,000      
Note receivable, interest rate 11.00%      
Commitment fee earned $ 400,000      
Notes receivable from loan acquired   28,684,000 28,268,000  
Income Taxes        
Income tax expense   $ 0 $ 0  
Cash Flow Hedging        
Derivative Financial Instruments        
Number of interest rate contracts | interest_rate_contract   7 3  
Allowance for Straight-Line Receivables        
Accounts Receivable and Allowance for Doubtful Accounts        
Allowance for doubtful accounts   $ 970,000 $ 554,000  
Building Improvements        
Accounting Policies [Line Items]        
Estimated useful life   39 years    
Land Improvements        
Accounting Policies [Line Items]        
Estimated useful life   15 years    
Furniture and Fixtures | Minimum        
Accounting Policies [Line Items]        
Estimated useful life   5 years    
Furniture and Fixtures | Maximum        
Accounting Policies [Line Items]        
Estimated useful life   7 years    
Notes Payable | New Accounting Pronouncement, Early Adoption, Effect        
Accounting Policies [Line Items]        
Deferred finance costs, net   $ 5,400,000    
Prepaid Expenses and Other Current Assets | New Accounting Pronouncement, Early Adoption, Effect        
Accounting Policies [Line Items]        
Deferred finance costs, net   $ 3,300,000