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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Assets and Liabilities of Consolidated VIEs (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
securitization
Dec. 31, 2017
USD ($)
securitization
Dec. 31, 2016
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents $ 103,724 $ 95,191 $ 83,554
Multi-family loans held in securitization trusts, at fair value 11,679,847 9,657,421  
Real estate held for sale in consolidated variable interest entities 29,704 64,202  
Receivables and other assets 114,821 108,567  
Total Assets [1] 14,737,638 12,056,285  
Securitized debt 42,335 81,537  
Mortgages and notes payable in consolidated variable interest entities 31,227 57,124  
Accrued expenses and other liabilities 101,228 82,126  
Total liabilities [1] 13,557,345 $ 11,080,284  
Number of securitizations considered non-financing VIEs | securitization   6  
Class A Notes | Collateralized Mortgage Obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Transfer of financial assets accounted for as sale, initial fair value of assets obtained as proceeds $ 177,500 $ 177,500  
Available-for-sale securities, debt securities, ownership percentage 5.00%    
Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential and multi-family collateralized debt obligations $ 53,040 70,308  
Multi-family collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential and multi-family collateralized debt obligations 11,022,248 9,189,459  
Multi-family CMBS Re-securitization      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investment securities available for sale, at fair value held in securitization trusts 52,700 47,922  
Receivables and other assets 4,243 4,333  
Total Assets 1,164,014 1,209,981  
Securitized debt 30,121 29,164  
Accrued expenses and other liabilities 4,228 4,316  
Total liabilities $ 1,070,953 $ 1,127,524  
Multi-family CMBS Re-securitization | K-Series      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of securitizations | securitization 2 2  
Number of consolidated securitizations | securitization 1 1  
Multi-family CMBS Re-securitization | Multi-family collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential and multi-family collateralized debt obligations $ 1,036,604 $ 1,094,044  
Multi-family CMBS Re-securitization | Residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans   0  
Multi-family CMBS Re-securitization | Multi-family loans held in securitization trusts, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family loans held in securitization trusts, at fair value 1,107,071 1,157,726  
Financing VIEs, Distressed Residential Mortgage Loan Securitization      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivables and other assets 10,287 15,428  
Total Assets 98,383 137,219  
Securitized debt 12,214 52,373  
Accrued expenses and other liabilities 444 2,957  
Total liabilities 12,658 55,330  
Financing VIEs, Distressed Residential Mortgage Loan Securitization | Residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans   0  
Financing VIEs, Distressed Residential Mortgage Loan Securitization | Distressed residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans 88,096 121,791  
Financing VIEs, Residential Mortgage Loan Securitization      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivables and other assets 1,061 935  
Total Assets 57,856 74,755  
Accrued expenses and other liabilities 26 24  
Total liabilities 53,066 70,332  
Financing VIEs, Residential Mortgage Loan Securitization | Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential and multi-family collateralized debt obligations 53,040 70,308  
Financing VIEs, Residential Mortgage Loan Securitization | Residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans 56,795 73,820  
Other VIEs, Multi-family CMBS      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Receivables and other assets 37,679 29,301  
Total Assets 10,610,455 8,528,996  
Accrued expenses and other liabilities 37,022 28,969  
Total liabilities 10,022,666 8,124,384  
Other VIEs, Multi-family CMBS | Multi-family collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential and multi-family collateralized debt obligations 9,985,644 8,095,415  
Other VIEs, Multi-family CMBS | Residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans   0  
Other VIEs, Multi-family CMBS | Multi-family loans held in securitization trusts, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family loans held in securitization trusts, at fair value 10,572,776 8,499,695  
Other VIEs      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 708 808  
Real estate held for sale in consolidated variable interest entities 29,704 64,202  
Receivables and other assets 23,254 25,507  
Total Assets 53,666 90,517  
Mortgages and notes payable in consolidated variable interest entities 31,227 57,124  
Accrued expenses and other liabilities 1,166 1,727  
Total liabilities 32,393 58,851  
Financing And Other VIEs      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash and cash equivalents 708 808  
Investment securities available for sale, at fair value held in securitization trusts 52,700 47,922  
Real estate held for sale in consolidated variable interest entities 29,704 64,202  
Receivables and other assets 76,524 75,504  
Total Assets 11,984,374 10,041,468  
Securitized debt 42,335 81,537  
Mortgages and notes payable in consolidated variable interest entities 31,227 57,124  
Accrued expenses and other liabilities 42,886 37,993  
Total liabilities 11,191,736 9,436,421  
Financing And Other VIEs | Residential collateralized debt obligations      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential and multi-family collateralized debt obligations 53,040 70,308  
Financing And Other VIEs | Multi-family collateralized debt obligations, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential and multi-family collateralized debt obligations 11,022,248 9,189,459  
Financing And Other VIEs | Residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans 56,795 73,820  
Financing And Other VIEs | Distressed residential mortgage loans held in securitization trusts, net      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Residential mortgage loans 88,096 121,791  
Financing And Other VIEs | Multi-family loans held in securitization trusts, at fair value      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Multi-family loans held in securitization trusts, at fair value $ 11,679,847 $ 9,657,421  
Non-Financing VIEs, Multi-Family CMBS | K-Series      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Number of securitizations considered non-financing VIEs | securitization 8 6  
[1] Our 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 December 31, 2018 and December 31, 2017, assets of consolidated VIEs totaled $11,984,374 and $10,041,468, respectively, and the liabilities of consolidated VIEs totaled $11,191,736 and $9,436,421, respectively. See Note 10 for further discussion.