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Related Party Arrangements - Equity Plan Grants and Investment Activity (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2020
Jun. 30, 2020
Apr. 30, 2020
Mar. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
May 31, 2018
Mar. 31, 2018
Jul. 31, 2017
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jul. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Related Party Transaction [Line Items]                                    
Granted (in shares)                         237,340          
Outstanding (in shares)                   927,414     927,414   1,335,590      
Share-based compensation expense                   $ 1,376   $ 2,910 $ 3,267 $ 7,466        
Loans and preferred equity held for investment, net                   2,103,414     2,103,414   $ 2,576,332      
Face value                   2,149,018     2,149,018   2,858,423      
Purchase of Class A office campus                             127,356      
Carrying value                   2,546,252     2,546,252   3,188,498      
Loan carrying value                   2,143,938     $ 2,143,938   2,848,956      
Maturity period of debt instruments depending upon the asset type (in years)                         3 years 7 months 6 days          
Fixed rate                                    
Related Party Transaction [Line Items]                                    
Face value                   182,377     $ 182,377   351,351      
Fixed rate | Loans and preferred equity held for investment                                    
Related Party Transaction [Line Items]                                    
Loan carrying value                   $ 181,635     $ 181,635   350,264      
Mixed-use project | Core                                    
Related Party Transaction [Line Items]                                    
Payments of protective advances to senior mortgage lender   $ 7,000 $ 28,500               $ 28,500              
Impairment of investments                     $ 89,300              
Land site and development of office building                                    
Related Party Transaction [Line Items]                                    
Joint venture commitment           $ 69,900                        
Interest in joint venture (in percentage)           50.00%                        
Joint venture, total commitment           $ 139,700                        
Maturity period of debt instruments depending upon the asset type (in years)           3 years 6 months                        
Mixed-use development project in Ireland                                    
Related Party Transaction [Line Items]                                    
Joint venture commitment         $ 162,400                          
Interest in joint venture (in percentage)         61.00%         61.00%     61.00%          
Joint venture, total commitment         $ 266,500         $ 310,900     $ 310,900          
Mezzanine loan, luxury condominium development project in New York, New York | Mezzanine loans | LIBOR                                    
Related Party Transaction [Line Items]                                    
Loan interest rate (in percentage)         9.50%                          
Mezzanine loan, luxury condominium development project in New York, New York | Loans and preferred equity held for investment | Mezzanine loans                                    
Related Party Transaction [Line Items]                                    
Loan carrying value         $ 20,000                          
Mezzanine loan | LA hospitality, retail, and condominium                                    
Related Party Transaction [Line Items]                                    
Loans and preferred equity held for investment, net                               $ 189,000    
Mezzanine loan | Investment in mezzanine loan                                    
Related Party Transaction [Line Items]                                    
Mezzanine loan investment                 $ 60,000                  
Mezzanine loan                 $ 180,000                  
Joint venture commitment                                   $ 101,800
Interest in joint venture (in percentage)                                   31.80%
Fixed interest rate                                   13.00%
Mezzanine loan | Upsized mezzanine loan with affiliate                                    
Related Party Transaction [Line Items]                                    
Joint venture commitment                                 $ 101,800  
Interest in joint venture (in percentage)                               45.20%    
Fixed interest rate                               13.00%    
Preferred equity interests | Fixed rate                                    
Related Party Transaction [Line Items]                                    
Face value                   18,350     $ 18,350   $ 115,384      
Preferred equity debt investment fixed interest rate (in percentage)                         15.00%   12.50%      
Preferred equity interests | Fixed rate | Loans and preferred equity held for investment                                    
Related Party Transaction [Line Items]                                    
Loan carrying value                   $ 18,350     $ 18,350   $ 115,313      
Preferred equity interests | Land site and development of office building | Fixed rate                                    
Related Party Transaction [Line Items]                                    
Preferred equity debt investment fixed interest rate (in percentage)           12.50%                        
Preferred equity interests | Land site and development of office building | Fixed rate | Loans and preferred equity held for investment                                    
Related Party Transaction [Line Items]                                    
Loan carrying value           $ 66,700                        
Preferred equity interests | Mixed-use development project in Ireland | Fixed rate                                    
Related Party Transaction [Line Items]                                    
Preferred equity debt investment fixed interest rate (in percentage)         15.00%                          
Maturity term (in years)         2 years                          
Management                                    
Related Party Transaction [Line Items]                                    
Granted (in shares)     143,000 800,000       978,946                    
Outstanding (in shares)                   927,414     927,414          
Share-based compensation expense                   $ 1,300   $ 2,800 $ 3,000 $ 7,100        
Affiliated Entity                                    
Related Party Transaction [Line Items]                                    
Purchase of Class A office campus           326,800                        
Carrying value           $ 197,700                        
Affiliated Entity | July 2018 Senior Mortgage Private Bond                                    
Related Party Transaction [Line Items]                                    
Fixed interest rate           3.91%                        
Initial debt term (in years)           5 years                        
Affiliated Entity | Land site and development of office building                                    
Related Party Transaction [Line Items]                                    
Interest in joint venture (in percentage)           50.00%                        
Affiliated Entity | Mixed-use development project in Ireland                                    
Related Party Transaction [Line Items]                                    
Interest in joint venture (in percentage)         39.00%                          
Affiliated Entity | Mezzanine loan | Investment in mezzanine loan                                    
Related Party Transaction [Line Items]                                    
Interest in joint venture (in percentage)                                   68.20%
Affiliated Entity | Preferred equity investment                                    
Related Party Transaction [Line Items]                                    
Interest in joint venture (in percentage)             27.20%                      
Face value             $ 89,100                      
Preferred equity debt investment fixed interest rate (in percentage)             12.00%                      
Impairment of investments $ 20,600