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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Nov. 12, 2020
Variable Interest Entity [Line Items]          
Principal balance   $ 14,700      
Purchase of senior securities   18 $ 36    
Realized loss   (7,058) 147,918    
Realized loss on de-consolidation of Consolidated K-Series   0 (54,118)    
Unrealized losses, net   (26,166) 396,780    
Non-controlling interest in consolidated variable interest entities   5,498   $ 6,371  
VIE, Primary Beneficiary | Preferred equity investments in multi-family properties          
Variable Interest Entity [Line Items]          
Investment owned, fair value         $ 8,700
Operating real estate   31,500     50,500
Lease intangible   1,600     1,600
Mortgages payable in consolidated variable interest entities   25,800     36,800
Non-controlling interest in consolidated variable interest entities   500     $ 6,800
VIE, Primary Beneficiary | Consolidated SLST          
Variable Interest Entity [Line Items]          
Investment in Consolidated SLST limited to securities owned, net carrying value   $ 219,800   $ 212,100  
Purchase of senior securities     40,000    
Proceeds from sale of investment     62,600    
Realized loss     2,400    
VIE, Primary Beneficiary | Consolidated K-Series          
Variable Interest Entity [Line Items]          
Multi-family loans held in securitization trusts, at Fair Value $ 17,400,000   17,400,000    
IOs and mezzanine securities transferred to available-for-sale securities from consolidated K-series due to de-consolidation 237,300   237,300    
VIE, Primary Beneficiary | Consolidated K-Series | Multi Family Collateralized Debt Obligations          
Variable Interest Entity [Line Items]          
Collateralized debt, carrying value 16,600,000   $ 16,600,000    
VIE, Primary Beneficiary | Consolidated K-Series | Fist Loss POs And Mezzanine Securities          
Variable Interest Entity [Line Items]          
Proceeds from sales resulting in de-consolidation of Consolidated K-Series 555,200        
Realized loss on de-consolidation of Consolidated K-Series (54,100)        
Unrealized losses, net $ 168,500