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Summary of Significant Accounting Policies - Narrative (Details)
3 Months Ended
Aug. 19, 2014
USD ($)
Mar. 31, 2016
USD ($)
property
entity
Mar. 31, 2015
USD ($)
Mar. 31, 2016
Properties
Mar. 31, 2016
USD ($)
Dec. 31, 2015
property
Dec. 31, 2015
Properties
Dec. 31, 2015
USD ($)
Property, Plant and Equipment                
Number of joint ventures consolidated as VIEs | entity   2            
Capitalized personnel costs   $ 2,300,000 $ 900,000          
Capitalized interest   $ 2,600,000 2,000,000          
Period after which major construction is complete   1 year            
Impairment of Long-Lived Assets                
Number of properties held for sale   1   1   1 2  
Asset impairment charges   $ 0 $ 0          
Goodwill                
Goodwill         $ 8,754,000     $ 8,754,000
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              
Note receivable interest rate 11.00%              
Commitment fee earned $ 400,000              
Notes receivable, net         $ 28,788,000     $ 28,684,000
Income Taxes                
Income tax expense   $ 0            
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