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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
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and cash equivalents $ 228,333   $ 244,718 $ 355,276    
Assets of disposal group held for sale 909,731   1,151,784      
Other assets 245,170   259,356      
Total Assets [1] 6,937,870   6,240,745      
Liabilities of disposal group held for sale 767,329   883,812      
Other liabilities 116,626   115,991      
Total Liabilities [1] 5,321,289   4,376,634      
Non-controlling interest in Consolidated VIEs 20,327   33,092      
Residential collateralized debt obligations            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Multi-family CDOs, at fair value 1,318,131   1,468,222      
Consolidated SLST CDOs            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Multi-family CDOs, at fair value 584,741   634,495      
VIE, Primary Beneficiary            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Total Assets 3,822,228   4,261,097      
Total Liabilities 3,092,097   3,403,257      
Redeemable non-controlling interest in Consolidated VIEs 21,026 $ 34,571 63,803 $ 27,786 $ 37,101 $ 66,392
VIE, Primary Beneficiary | Financing And Other VIEs            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and cash equivalents 7,120   21,129      
Real estate, net held in Consolidated VIEs 542,797   543,739      
Assets of disposal group held for sale 904,658   1,142,773      
Other assets 110,697   109,760      
Total Assets 3,822,228   4,261,097      
Multi-family CDOs, at fair value 1,902,872   2,102,717      
Mortgages payable on real estate, net in Consolidated VIEs 396,810   394,707      
Liabilities of disposal group held for sale 767,329   883,812      
Other liabilities 25,086   22,021      
Total Liabilities 3,092,097   3,403,257      
Redeemable non-controlling interest in Consolidated VIEs 21,026   63,803      
Non-controlling interest in Consolidated VIEs 20,202   32,967      
Net investment 688,903   761,070      
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 90,223   92,906      
Total Assets 1,604,575   1,709,020      
Multi-family CDOs, at fair value 1,318,131   1,468,222      
Mortgages payable on real estate, net in Consolidated VIEs 0   0      
Liabilities of disposal group held for sale 0   0      
Other liabilities 7,575   8,168      
Total Liabilities 1,325,706   1,476,390      
Redeemable non-controlling interest in Consolidated VIEs 0   0      
Non-controlling interest in Consolidated VIEs 0   0      
Net investment 278,869   232,630      
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 3,018   3,168      
Total Assets 745,622   830,750      
Multi-family CDOs, at fair value 584,741   634,495      
Mortgages payable on real estate, net in Consolidated VIEs 0   0      
Liabilities of disposal group held for sale 0   0      
Other liabilities 5,138   3,342      
Total Liabilities 589,879   637,837      
Redeemable non-controlling interest in Consolidated VIEs 0   0      
Non-controlling interest in Consolidated VIEs 0   0      
Net investment 155,743   192,913      
VIE, Primary Beneficiary | Consolidated Real Estate            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Cash and cash equivalents 7,120   21,129      
Real estate, net held in Consolidated VIEs 542,797   543,739      
Assets of disposal group held for sale 904,658   1,142,773      
Other assets 17,456   13,686      
Total Assets 1,472,031   1,721,327      
Multi-family CDOs, at fair value 0   0      
Mortgages payable on real estate, net in Consolidated VIEs 396,810   394,707      
Liabilities of disposal group held for sale 767,329   883,812      
Other liabilities 12,373   10,511      
Total Liabilities 1,176,512   1,289,030      
Redeemable non-controlling interest in Consolidated VIEs 21,026   63,803      
Non-controlling interest in Consolidated VIEs 20,202   32,967      
Net investment 254,291   335,527      
VIE, Primary Beneficiary | Residential collateralized debt obligations            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Multi-family CDOs, at fair value 1,318,131   1,468,222      
VIE, Primary Beneficiary | Consolidated SLST CDOs            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Multi-family CDOs, at fair value 584,741   634,495      
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 2,256,956   2,443,696      
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 1,514,352   1,616,114      
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 742,604   827,582      
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 September 30, 2023 and December 31, 2022, assets of consolidated VIEs totaled $3,822,228 and $4,261,097, respectively, and the liabilities of consolidated VIEs totaled $3,092,097 and $3,403,257, respectively. See Note 7 for further discussion.