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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Assets and Liabilities of Consolidated VIEs (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents $ 226,939 $ 187,107 $ 227,753  
Assets of disposal group held for sale 146,363 426,017    
Other assets 344,999 315,357    
Total Assets [1] 7,446,815 7,401,328    
Liabilities of disposal group held for sale 122,318 386,024    
Other liabilities 110,751 118,016    
Total Liabilities [1] 5,927,481 5,773,202    
Non-controlling interest in Consolidated VIEs 13,950 20,453    
Collateralized Debt Obligations | Secured Debt        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Multi-family CDOs, at fair value 2,188,362 1,870,517    
Collateralized Debt Obligations | Residential loan securitizations at amortized cost | Secured Debt        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Multi-family CDOs, at fair value 1,108,594 1,276,780    
Residential loan securitizations at amortized cost, net        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Multi-family CDOs, at fair value 1,108,594 1,276,780    
Consolidated SLST        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Multi-family CDOs, at fair value 1,079,768 593,737    
VIE, Primary Beneficiary        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Real estate, net held in Consolidated VIEs 1,154,221 1,131,819    
Total Assets 3,829,183 3,816,777    
Total Liabilities 3,192,392 3,076,818    
Redeemable non-controlling interest in Consolidated VIEs 20,128 28,061 $ 54,352 $ 63,803
VIE, Primary Beneficiary | Financing And Other VIEs        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 14,325 15,612    
Real estate, net held in Consolidated VIEs 1,005,161 979,934    
Assets of disposal group held for sale 146,363 426,017    
Other assets 200,958 138,446    
Total Assets 3,829,183 3,816,777    
Multi-family CDOs, at fair value 2,188,362 1,870,517    
Mortgages payable on real estate, net in Consolidated VIEs 850,743 784,421    
Liabilities of disposal group held for sale 122,318 386,024    
Other liabilities 30,969 35,856    
Total Liabilities 3,192,392 3,076,818    
Redeemable non-controlling interest in Consolidated VIEs 20,128 28,061    
Non-controlling interest in Consolidated VIEs 13,825 20,328    
Net investment 602,838 691,570    
VIE, Primary Beneficiary | Residential Loan Securitizations        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 0 0    
Real estate, net held in Consolidated VIEs 0 0    
Assets of disposal group held for sale 0 0    
Other assets 166,374 98,451    
Total Assets 1,890,624 1,600,359    
Multi-family CDOs, at fair value 1,605,735 1,276,780    
Mortgages payable on real estate, net in Consolidated VIEs 0 0    
Liabilities of disposal group held for sale 0 0    
Other liabilities 9,909 8,421    
Total Liabilities 1,615,644 1,285,201    
Redeemable non-controlling interest in Consolidated VIEs 0 0    
Non-controlling interest in Consolidated VIEs 0 0    
Net investment 274,980 315,158    
VIE, Primary Beneficiary | Consolidated SLST        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 0 0    
Real estate, net held in Consolidated VIEs 0 0    
Assets of disposal group held for sale 0 0    
Other assets 2,905 2,960    
Total Assets 741,031 757,820    
Multi-family CDOs, at fair value 582,627 593,737    
Mortgages payable on real estate, net in Consolidated VIEs 0 0    
Liabilities of disposal group held for sale 0 0    
Other liabilities 5,897 5,638    
Total Liabilities 588,524 599,375    
Redeemable non-controlling interest in Consolidated VIEs 0 0    
Non-controlling interest in Consolidated VIEs 0 0    
Net investment 152,507 158,445    
VIE, Primary Beneficiary | Consolidated Real Estate        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents 14,325 15,612    
Real estate, net held in Consolidated VIEs 1,005,161 979,934    
Assets of disposal group held for sale 146,363 426,017    
Other assets 31,679 37,035    
Total Assets 1,197,528 1,458,598    
Multi-family CDOs, at fair value 0 0    
Mortgages payable on real estate, net in Consolidated VIEs 850,743 784,421    
Liabilities of disposal group held for sale 122,318 386,024    
Other liabilities 15,163 21,797    
Total Liabilities 988,224 1,192,242    
Redeemable non-controlling interest in Consolidated VIEs 20,128 28,061    
Non-controlling interest in Consolidated VIEs 13,825 20,328    
Net investment 175,351 217,967    
VIE, Primary Beneficiary | Residential loan securitizations at amortized cost, net        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Multi-family CDOs, at fair value 1,108,594 1,276,780    
VIE, Primary Beneficiary | Consolidated SLST        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Multi-family CDOs, at fair value 1,079,768 593,737    
VIE, Primary Beneficiary | Residential loans, at fair value | Financing And Other VIEs        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Residential loans, at fair value 2,462,376 2,256,768    
VIE, Primary Beneficiary | Residential loans, at fair value | Residential Loan Securitizations        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Residential loans, at fair value 1,724,250 1,501,908    
VIE, Primary Beneficiary | Residential loans, at fair value | Consolidated SLST        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Residential loans, at fair value 738,126 754,860    
VIE, Primary Beneficiary | Residential loans, at fair value | Consolidated Real Estate        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Residential loans, at fair value $ 0 $ 0    
[1] Our condensed consolidated balance sheets include assets and liabilities of consolidated variable interest entities ("VIEs") as the Company is the primary beneficiary of these VIEs. As of March 31, 2024 and December 31, 2023, assets of consolidated VIEs totaled $3,829,183 and $3,816,777, respectively, and the liabilities of consolidated VIEs totaled $3,192,392 and $3,076,818, respectively. See Note 7 for further discussion.