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Real Estate and Other Affiliates (Summary of Equity Investments in Real Estate and Other Affiliates) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Dec. 31, 2020
Jun. 30, 2020
Investments in and Advances to Affiliates [Line Items]          
Investment in real estate and other affiliates $ 389,586     $ 377,145  
Share of Earnings/Dividends 15,796   $ 11,349    
Equity Method Investments          
Investments in and Advances to Affiliates [Line Items]          
Equity Method Investments 385,633     373,192  
Share of Earnings/Dividends 12,041   7,625    
Other equity investments          
Investments in and Advances to Affiliates [Line Items]          
Other equity investments 3,953     3,953  
Share of Earnings/Dividends 3,755   3,724    
110 North Wacker          
Investments in and Advances to Affiliates [Line Items]          
Equity Method Investments   $ 273,600      
The Metropolitan Downtown Columbia | Accounts Payable and Accrued Liabilities          
Investments in and Advances to Affiliates [Line Items]          
Investment deficit position 5,500     5,000  
Operating Assets Segment | 110 North Wacker | Equity Method Investments          
Investments in and Advances to Affiliates [Line Items]          
Equity Method Investments 247,175     $ 261,143  
Share of Earnings/Dividends $ (15,705)   0    
Operating Assets Segment | The Metropolitan Downtown Columbia | Equity Method Investments          
Investments in and Advances to Affiliates [Line Items]          
Economic/Legal Ownership 50.00%     50.00%  
Equity Method Investments $ 0     $ 0  
Share of Earnings/Dividends $ (54)   227    
Operating Assets Segment | Stewart Title of Montgomery County, TX | Equity Method Investments          
Investments in and Advances to Affiliates [Line Items]          
Economic/Legal Ownership 50.00%     50.00%  
Equity Method Investments $ 4,176     $ 3,924  
Share of Earnings/Dividends $ 251   343    
Operating Assets Segment | Woodlands Sarofim #1 | Equity Method Investments          
Investments in and Advances to Affiliates [Line Items]          
Economic/Legal Ownership 20.00%     20.00%  
Equity Method Investments $ 3,151     $ 3,120  
Share of Earnings/Dividends $ 31   35    
Operating Assets Segment | m.flats/TEN.M | Equity Method Investments          
Investments in and Advances to Affiliates [Line Items]          
Economic/Legal Ownership 50.00%     50.00%  
Equity Method Investments $ 766     $ 1,247  
Share of Earnings/Dividends 318   65    
MPC Segment | The Summit | Equity Method Investments          
Investments in and Advances to Affiliates [Line Items]          
Equity Method Investments 122,805     $ 96,300  
Share of Earnings/Dividends $ 27,650   8,934    
Seaport Segment | Mr. C Seaport          
Investments in and Advances to Affiliates [Line Items]          
Economic/Legal Ownership         35.00%
Seaport Segment | Mr. C Seaport | Equity Method Investments          
Investments in and Advances to Affiliates [Line Items]          
Economic/Legal Ownership 0.00%     0.00%  
Equity Method Investments $ 0     $ 0  
Share of Earnings/Dividends 0   (651)    
Seaport Segment | Ssäm Bar (Momofuku) | Equity Method Investments          
Investments in and Advances to Affiliates [Line Items]          
Equity Method Investments 7,302     $ 7,101  
Share of Earnings/Dividends $ (352)   (1,392)    
Strategic Developments Segment | 110 North Wacker          
Investments in and Advances to Affiliates [Line Items]          
Share of Earnings/Dividends   $ 267,500      
Strategic Developments Segment | Circle T Ranch and Power Center | Equity Method Investments          
Investments in and Advances to Affiliates [Line Items]          
Economic/Legal Ownership 0.00% 50.00%   0.00%  
Equity Method Investments $ 0     $ 0  
Share of Earnings/Dividends $ 0   86    
Strategic Developments Segment | HHMK Development | Equity Method Investments          
Investments in and Advances to Affiliates [Line Items]          
Economic/Legal Ownership 50.00%     50.00%  
Equity Method Investments $ 10     $ 10  
Share of Earnings/Dividends $ 0   0    
Strategic Developments Segment | KR Holdings | Equity Method Investments          
Investments in and Advances to Affiliates [Line Items]          
Economic/Legal Ownership 50.00%     50.00%  
Equity Method Investments $ 248     $ 347  
Share of Earnings/Dividends $ (98)   $ (22)