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Commitments and Contingencies (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Aug. 31, 2013
USD ($)
extension
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Property
Loss Contingencies [Line Items]            
Number of properties, under development | Property           3
Deferred pre-development costs           $ 13,000,000.0
Litigation settlement $ 1,500,000          
Litigation expense       $ 1,100,000 $ 400,000  
Alternate Housing Guarantees            
Loss Contingencies [Line Items]            
Guarantee expiration period           5 days
Project Cost Guarantees            
Loss Contingencies [Line Items]            
Guarantee expiration period           1 year
Third-Party Development Projects            
Loss Contingencies [Line Items]            
Commitment under third-party development project           $ 8,800,000
Performance Guarantee            
Loss Contingencies [Line Items]            
Guarantee expiration period   60 days        
Estimate of possible loss           614,600,000
Earnest money deposits   $ 2,100,000        
Purchase and sale agreement upon exercise of option   $ 28,700,000        
Drexel University Property            
Loss Contingencies [Line Items]            
Lease term     40 years      
Number of lease renewal options | extension     3      
Lease extension period     10 years      
Commitment to pay real estate transfer taxes, amount (not more than)     $ 1,800,000      
Real estate transfer taxes paid upon conveyance of land     600,000      
Drexel University Property | Maximum            
Loss Contingencies [Line Items]            
Commitment to pay real estate transfer taxes, amount (not more than)     $ 2,400,000      
Disney College Program Phases I-V (ACE) | Performance Guarantee            
Loss Contingencies [Line Items]            
Development guarantee, damages due per bed each day of a delay           20
Guarantor obligations, maximum exposure           200,000
Construction Contracts            
Loss Contingencies [Line Items]            
Development projects under construction           $ 278,900,000