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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Nov. 12, 2020
Variable Interest Entity [Line Items]          
Principal balance   $ 14,700 $ 203,500    
Gain (loss) on extinguishment of debt   1,583 0 $ 2,857  
Payments to acquire other investments   98 477 991  
Realized gains (losses), net   21,451 (148,058) 32,642  
Proceeds from divestiture of interest in consolidated subsidiaries   0 0 3,587  
Deconsolidation gain (loss) amount   0 (54,118) 0  
Unrealized gains (losses), net   95,649 (160,161) $ 35,837  
Operating real estate   1,017,583 50,532    
Other liabilities   144,478 101,746    
Non-controlling interest in consolidated variable interest entities   24,359 6,371    
VIE, Primary Beneficiary          
Variable Interest Entity [Line Items]          
Redeemable non-controlling interests   67,096      
Fair value         $ 8,700
VIE, Primary Beneficiary | Preferred equity investments in multi-family properties          
Variable Interest Entity [Line Items]          
Operating real estate   926,800     50,500
Lease intangible   52,000     1,600
Other liabilities   15,900     1,500
Mortgages payable, net in consolidated variable interest entities   669,600     36,800
Redeemable non-controlling interests   67,100      
Non-controlling interest in consolidated variable interest entities   25,500     $ 6,800
Consolidated K-Series | VIE, Primary Beneficiary          
Variable Interest Entity [Line Items]          
Deconsolidation of financial instruments $ 17,400,000        
IOs and mezzanine securities transferred to available-for-sale securities from consolidated K-series due to de-consolidation 237,300        
Consolidated K-Series | VIE, Primary Beneficiary | Multi-family loans          
Variable Interest Entity [Line Items]          
Collateralized debt obligations 16,600,000        
Consolidated K-Series | VIE, Primary Beneficiary | First Loss POs And Mezzanine Securities          
Variable Interest Entity [Line Items]          
Proceeds from divestiture of interest in consolidated subsidiaries 555,200        
Deconsolidation gain (loss) amount (54,100)        
Unrealized gains (losses), net $ 168,500        
Consolidated SLST          
Variable Interest Entity [Line Items]          
Proceeds from sale of other investments   62,600      
Realized gains (losses), net   2,400      
Consolidated SLST | VIE, Primary Beneficiary          
Variable Interest Entity [Line Items]          
Investment in Consolidated SLST limited to securities owned, net carrying value   230,300 $ 212,100    
Payments to acquire other investments   $ 40,000