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Valuation (Significant Unobservable Inputs Rollforward) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
USD ($)
$ / shares
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
$ / shares
Fair Value, Measurements, Recurring      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 13,436,592   $ 13,357,204
Level 3      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 12,034,361 $ 2,881,539  
Assets, Accreted Discounts/Amortized Premiums (3,233) (8,488)  
Assets, Realized Gain (Loss) (3,337) 7,433  
Assets, Change In Net Unrealized Gain/(Loss) 218,706 (84,296)  
Assets, Purchases 856,154 1,174,093  
Assets, Sales (888,564) (604,284)  
Assets, Transfers into Level 3 25,486 13,300  
Assets, Transfers out of Level 3 (1,925) (30,471)  
Assets, Ending Balance 12,237,648 3,348,826  
Liabilities, Begining Balance (9,518,871) (984,168)  
Liabilities, Accreted Discounts/Amortized Premiums (402) 0  
Liabilities, Realized Gain/(Loss) 0 0  
Liabilities, Change In Net Unrealized Gain/(Loss) (154,704) 55,641  
Liabilities Purchases/Payments 310,989 114,754  
Liabilities, Sales/Issuance (332,845) (612,769)  
Liabilities, Transfers into Level 3 0 0  
Liabilities, Transfers out of Level 3 0 0  
Liabilities, Ending Balance (9,695,833) (1,426,542)  
Level 3 | Fair Value, Measurements, Recurring      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets 12,237,648   12,034,361
Level 3 | Non-Agency RMBS      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets 156,277   132,502
Level 3 | Non-Agency RMBS | Valuation, Income Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets 75,464   72,671
Level 3 | Non-Agency RMBS | Valuation, Market Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 80,813   $ 59,831
Level 3 | Non-Agency RMBS | Measurement Input, Quoted Price | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input | $ / shares 0.48   0.45
Level 3 | Non-Agency RMBS | Measurement Input, Quoted Price | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input | $ / shares 137.63   159.91
Level 3 | Non-Agency RMBS | Measurement Input, Quoted Price | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input | $ / shares 78.99   69.79
Level 3 | Non-Agency RMBS | Measurement Input, Discount Rate | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.000   0.000
Level 3 | Non-Agency RMBS | Measurement Input, Discount Rate | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.941   0.957
Level 3 | Non-Agency RMBS | Measurement Input, Discount Rate | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.114   0.121
Level 3 | Non-Agency RMBS | Measurement Input, Prepayment Rate | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.000   0.000
Level 3 | Non-Agency RMBS | Measurement Input, Prepayment Rate | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 1.000   1.000
Level 3 | Non-Agency RMBS | Measurement Input, Prepayment Rate | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.513   0.520
Level 3 | Non-Agency RMBS | Measurement Input, Default Rate | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.000   0.000
Level 3 | Non-Agency RMBS | Measurement Input, Default Rate | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.965   0.974
Level 3 | Non-Agency RMBS | Measurement Input, Default Rate | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.113   0.165
Level 3 | CMBS      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 11,767   $ 12,649
Level 3 | CMBS | Valuation, Income Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets 1,179   569
Level 3 | CMBS | Valuation, Market Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 10,588   $ 12,080
Level 3 | CMBS | Measurement Input, Quoted Price | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input | $ / shares 5.22   5.54
Level 3 | CMBS | Measurement Input, Quoted Price | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input | $ / shares 42.76   69.07
Level 3 | CMBS | Measurement Input, Quoted Price | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input | $ / shares 29.37   38.37
Level 3 | CMBS | Measurement Input, Discount Rate | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.110   0.094
Level 3 | CMBS | Measurement Input, Discount Rate | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.178   0.175
Level 3 | CMBS | Measurement Input, Discount Rate | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.154   0.127
Level 3 | CMBS | Measurement Input, Default Rate | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.018   0.012
Level 3 | CMBS | Measurement Input, Default Rate | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.490   0.398
Level 3 | CMBS | Measurement Input, Default Rate | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.064   0.058
Level 3 | CLOs      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 28,674   $ 24,598
Level 3 | CLOs | Valuation, Income Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets 8,044   6,673
Level 3 | CLOs | Valuation, Market Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 20,630   $ 17,925
Level 3 | CLOs | Measurement Input, Quoted Price | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input | $ / shares 25.00   3.96
Level 3 | CLOs | Measurement Input, Quoted Price | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input | $ / shares 94.68   92.00
Level 3 | CLOs | Measurement Input, Quoted Price | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input | $ / shares 79.09   57.94
Level 3 | CLOs | Measurement Input, Discount Rate | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.033   0.132
Level 3 | CLOs | Measurement Input, Discount Rate | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.401   0.361
Level 3 | CLOs | Measurement Input, Discount Rate | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.196   0.233
Level 3 | Asset-backed securities, backed by consumer loans | Valuation, Income Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 72,200   $ 73,644
Level 3 | Asset-backed securities, backed by consumer loans | Measurement Input, Discount Rate | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.069   0.067
Level 3 | Asset-backed securities, backed by consumer loans | Measurement Input, Discount Rate | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.229   0.279
Level 3 | Asset-backed securities, backed by consumer loans | Measurement Input, Discount Rate | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.132   0.135
Level 3 | Asset-backed securities, backed by consumer loans | Measurement Input, Prepayment Rate | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.000   0.000
Level 3 | Asset-backed securities, backed by consumer loans | Measurement Input, Prepayment Rate | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.209   0.183
Level 3 | Asset-backed securities, backed by consumer loans | Measurement Input, Prepayment Rate | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.150   0.144
Level 3 | Asset-backed securities, backed by consumer loans | Measurement Input, Default Rate | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.000   0.006
Level 3 | Asset-backed securities, backed by consumer loans | Measurement Input, Default Rate | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.284   0.352
Level 3 | Asset-backed securities, backed by consumer loans | Measurement Input, Default Rate | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Securities, measurement input 0.203   0.213
Level 3 | Residential mortgage loans | Valuation, Income Approach | Performing Financial Instruments [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 1,304,959   $ 1,416,951
Level 3 | Residential mortgage loans | Measurement Input, Discount Rate | Performing Financial Instruments [Member] | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.033   0.005
Level 3 | Residential mortgage loans | Measurement Input, Discount Rate | Performing Financial Instruments [Member] | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.222   0.535
Level 3 | Residential mortgage loans | Measurement Input, Discount Rate | Performing Financial Instruments [Member] | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.085   0.087
Level 3 | Commercial mortgage loans | Valuation, Income Approach | Performing Financial Instruments [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 346,116   $ 17,583
Level 3 | Commercial mortgage loans | Measurement Input, Discount Rate | Valuation, Income Approach | Performing Financial Instruments [Member] | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.061   0.230
Level 3 | Commercial mortgage loans | Measurement Input, Discount Rate | Valuation, Income Approach | Performing Financial Instruments [Member] | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.139   0.251
Level 3 | Commercial mortgage loans | Measurement Input, Discount Rate | Valuation, Income Approach | Performing Financial Instruments [Member] | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.108   0.248
Level 3 | Consumer loans | Valuation, Income Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 3,969   $ 4,843
Level 3 | Consumer loans | Measurement Input, Discount Rate | Valuation, Income Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.106   0.106
Level 3 | Consumer loans | Measurement Input, Discount Rate | Valuation, Income Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.366   0.282
Level 3 | Consumer loans | Measurement Input, Discount Rate | Valuation, Income Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.176   0.176
Level 3 | Consumer loans | Measurement Input, Prepayment Rate | Valuation, Income Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.000   0.001
Level 3 | Consumer loans | Measurement Input, Prepayment Rate | Valuation, Income Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.197   0.217
Level 3 | Consumer loans | Measurement Input, Prepayment Rate | Valuation, Income Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.113   0.122
Level 3 | Consumer loans | Measurement Input, Default Rate | Valuation, Income Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.000   0.004
Level 3 | Consumer loans | Measurement Input, Default Rate | Valuation, Income Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.463   0.612
Level 3 | Consumer loans | Measurement Input, Default Rate | Valuation, Income Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.132   0.132
Level 3 | Corporate loan [Member] | Valuation, Income Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 4,920   $ 4,086
Level 3 | Corporate loan [Member] | Measurement Input, Discount Rate | Valuation, Income Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.060   0.060
Level 3 | Corporate loan [Member] | Measurement Input, Discount Rate | Valuation, Income Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.125   0.130
Level 3 | Corporate loan [Member] | Measurement Input, Discount Rate | Valuation, Income Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.077   0.071
Level 3 | Credit default swaps on asset-backed securities | Valuation, Income Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 76   $ 76
Level 3 | Other secured borrowings, at fair value | Valuation, Market Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value $ (1,534,592)   $ (1,539,881)
Level 3 | Other secured borrowings, at fair value | Measurement Input, Quoted Price | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 39.43   54.94
Level 3 | Other secured borrowings, at fair value | Measurement Input, Quoted Price | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 99.43   98.22
Level 3 | Other secured borrowings, at fair value | Measurement Input, Quoted Price | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 87.55   87.34
Level 3 | Other secured borrowings, at fair value | Measurement Input, Discount Rate | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 0.059   0.037
Level 3 | Other secured borrowings, at fair value | Measurement Input, Discount Rate | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 0.095   0.085
Level 3 | Other secured borrowings, at fair value | Measurement Input, Discount Rate | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 0.068   0.069
Level 3 | Other secured borrowings, at fair value | Measurement Input, Prepayment Rate | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 0.930   0.933
Level 3 | Other secured borrowings, at fair value | Measurement Input, Prepayment Rate | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 0.951   0.963
Level 3 | Other secured borrowings, at fair value | Measurement Input, Prepayment Rate | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 0.940   0.945
Level 3 | Investment in unconsolidated entities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 118,747   $ 127,046
Level 3 | Investment in unconsolidated entities | Measurement Input, Net Asset Value | Enterprise Value      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets 83,117   88,905
Level 3 | Investment in unconsolidated entities | Measurement Input, Exercise Price | Valuation, Cost Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets 542   1,042
Level 3 | Senior Notes | Valuation, Market Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value $ (185,325)   $ (191,835)
Level 3 | Senior Notes | Measurement Input, Quoted Price | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 88.25   91.35
Level 3 | Senior Notes | Measurement Input, Quoted Price | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 88.25   91.35
Level 3 | Senior Notes | Measurement Input, Quoted Price | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 88.25   91.35
Level 3 | HECM loans | Valuation, Cost Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 64,955    
Level 3 | HECM loans | Valuation, Income Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 8,201,512   $ 7,993,635
Level 3 | HECM loans | Measurement Input, Discount Rate | Valuation, Income Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.032   0.042
Level 3 | HECM loans | Measurement Input, Discount Rate | Valuation, Income Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.061   0.063
Level 3 | HECM loans | Measurement Input, Discount Rate | Valuation, Income Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.042   0.052
Level 3 | HECM loans | Measurement Input, Prepayment Rate | Valuation, Income Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.071   0.018
Level 3 | HECM loans | Measurement Input, Prepayment Rate | Valuation, Income Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.439   0.446
Level 3 | HECM loans | Measurement Input, Prepayment Rate | Valuation, Income Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.093   0.098
Level 3 | Proprietary reverse mortgage loans | Valuation, Income Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 138,234   $ 103,602
Level 3 | Proprietary reverse mortgage loans | Measurement Input, Discount Rate | Valuation, Income Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.074   0.065
Level 3 | Proprietary reverse mortgage loans | Measurement Input, Discount Rate | Valuation, Income Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.083   0.086
Level 3 | Proprietary reverse mortgage loans | Measurement Input, Discount Rate | Valuation, Income Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.076   0.081
Level 3 | Proprietary reverse mortgage loans | Measurement Input, Prepayment Rate | Valuation, Income Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.110   0.110
Level 3 | Proprietary reverse mortgage loans | Measurement Input, Prepayment Rate | Valuation, Income Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.371   0.371
Level 3 | Proprietary reverse mortgage loans | Measurement Input, Prepayment Rate | Valuation, Income Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Loans, Measurement Input 0.148   0.138
Level 3 | Mortgage servicing rights | Valuation, Income Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 8,100   $ 8,108
Level 3 | Mortgage servicing rights | Measurement Input, Discount Rate | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.120   0.120
Level 3 | Mortgage servicing rights | Measurement Input, Discount Rate | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.120   0.120
Level 3 | Mortgage servicing rights | Measurement Input, Discount Rate | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.120   0.120
Level 3 | Mortgage servicing rights | Measurement Input, Prepayment Rate | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.110   0.110
Level 3 | Mortgage servicing rights | Measurement Input, Prepayment Rate | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.371   0.371
Level 3 | Mortgage servicing rights | Measurement Input, Prepayment Rate | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.139   0.147
Level 3 | Servicing-related asset | Valuation, Income Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 299   $ 999
Level 3 | Servicing-related asset | Measurement Input, Discount Rate | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.117   0.117
Level 3 | Servicing-related asset | Measurement Input, Discount Rate | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.117   0.117
Level 3 | Servicing-related asset | Measurement Input, Discount Rate | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.117   0.117
Level 3 | Loan commitments | Valuation, Income Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total assets $ 3,299   $ 3,060
Level 3 | Loan commitments | Measurement Input pullthrough rate | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.574   0.562
Level 3 | Loan commitments | Measurement Input pullthrough rate | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 1.000   1.000
Level 3 | Loan commitments | Measurement Input pullthrough rate | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.759   0.737
Level 3 | Loan commitments | measurement input cost to originate loan | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.020   0.024
Level 3 | Loan commitments | measurement input cost to originate loan | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.066   0.071
Level 3 | Loan commitments | measurement input cost to originate loan | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Servicing Asset, Measurement Input 0.048   0.044
Level 3 | HMBS-related obligations | Valuation, Market Approach      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fair value $ (7,975,916)   $ (7,787,155)
Level 3 | HMBS-related obligations | Measurement Input, Discount Rate | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 0.031   0.041
Level 3 | HMBS-related obligations | Measurement Input, Discount Rate | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 0.061   0.061
Level 3 | HMBS-related obligations | Measurement Input, Discount Rate | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 0.041   0.051
Level 3 | HMBS-related obligations | Measurement Input, Prepayment Rate | Valuation, Market Approach | Minimum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 0.071   0.073
Level 3 | HMBS-related obligations | Measurement Input, Prepayment Rate | Valuation, Market Approach | Maximum      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 0.439   0.367
Level 3 | HMBS-related obligations | Measurement Input, Prepayment Rate | Valuation, Market Approach | Weighted Average      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Debt instrument, measurement input 0.093   0.098
Level 3 | Other secured borrowings, at fair value      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Liabilities, Payments   114,754  
Liabilities, Issuances   (402,769)  
Liabilities, Begining Balance $ (1,539,881) (984,168)  
Liabilities, Accreted Discounts/Amortized Premiums (402) 0  
Liabilities, Realized Gain/(Loss) 0 0  
Liabilities, Change In Net Unrealized Gain/(Loss) (29,680) 55,641  
Liabilities Purchases/Payments 35,371    
Liabilities, Sales/Issuance 0    
Liabilities, Transfers into Level 3 0 0  
Liabilities, Transfers out of Level 3 0 0  
Liabilities, Ending Balance (1,534,592) (1,216,542)  
Change in unrealized gains (losses), liabilities (29,700) 55,600  
Level 3 | Senior notes      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Liabilities, Begining Balance (191,835) 0  
Liabilities, Accreted Discounts/Amortized Premiums 0 0  
Liabilities, Realized Gain/(Loss) 0 0  
Liabilities, Change In Net Unrealized Gain/(Loss) 6,510 0  
Liabilities Purchases/Payments 0 0  
Liabilities, Sales/Issuance 0 (210,000)  
Liabilities, Transfers into Level 3 0 0  
Liabilities, Transfers out of Level 3 0 0  
Liabilities, Ending Balance (185,325) (210,000)  
Level 3 | Senior Notes      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Change in unrealized gains (losses), liabilities 6,500    
Level 3 | HMBS-related obligations      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Liabilities, Begining Balance (7,787,155)    
Liabilities, Accreted Discounts/Amortized Premiums 0    
Liabilities, Realized Gain/(Loss) 0    
Liabilities, Change In Net Unrealized Gain/(Loss) (131,534)    
Liabilities Purchases/Payments 275,618    
Liabilities, Sales/Issuance (332,845)    
Liabilities, Transfers into Level 3 0    
Liabilities, Transfers out of Level 3 0    
Liabilities, Ending Balance (7,975,916)    
Change in unrealized gains (losses), liabilities (131,500)    
Level 3 | Securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Change in unrealized gain (loss), assets (3,600) (4,300)  
Level 3 | Securities | Agency RMBS      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 7,027 9,710  
Assets, Accreted Discounts/Amortized Premiums (349) (573)  
Assets, Realized Gain (Loss) (13) 362  
Assets, Change In Net Unrealized Gain/(Loss) 156 (1,211)  
Assets, Purchases 141 399  
Assets, Sales (872) (514)  
Assets, Transfers into Level 3 194 1,500  
Assets, Transfers out of Level 3 (91) (1,052)  
Assets, Ending Balance 6,193 8,621  
Level 3 | Securities | Non-Agency RMBS      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 132,502 134,888  
Assets, Accreted Discounts/Amortized Premiums 132 479  
Assets, Realized Gain (Loss) 891 (126)  
Assets, Change In Net Unrealized Gain/(Loss) (4,376) (2,391)  
Assets, Purchases 30,533 3,401  
Assets, Sales (23,422) (6,688)  
Assets, Transfers into Level 3 21,582 5,998  
Assets, Transfers out of Level 3 (1,565) (18,785)  
Assets, Ending Balance 156,277 116,776  
Level 3 | Securities | CMBS      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 12,649 13,134  
Assets, Accreted Discounts/Amortized Premiums 50 41  
Assets, Realized Gain (Loss) 0 1,143  
Assets, Change In Net Unrealized Gain/(Loss) (1,421) (747)  
Assets, Purchases 0 3,101  
Assets, Sales 0 (2,234)  
Assets, Transfers into Level 3 758 2,926  
Assets, Transfers out of Level 3 269 7,838  
Assets, Ending Balance 11,767 9,526  
Level 3 | Securities | CLOs      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 24,598 26,678  
Assets, Accreted Discounts/Amortized Premiums 169 (716)  
Assets, Realized Gain (Loss) 89 953  
Assets, Change In Net Unrealized Gain/(Loss) (614) 1,610  
Assets, Purchases 1,481 0  
Assets, Sales (1) (5,781)  
Assets, Transfers into Level 3 2,952 2,876  
Assets, Transfers out of Level 3 0 (2,796)  
Assets, Ending Balance 28,674 22,824  
Level 3 | Securities | Asset-backed securities, backed by consumer loans      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 73,644 73,108  
Assets, Accreted Discounts/Amortized Premiums (1,327) (1,113)  
Assets, Realized Gain (Loss) 78 (274)  
Assets, Change In Net Unrealized Gain/(Loss) (2,072) (2,023)  
Assets, Purchases 12,140 18,792  
Assets, Sales (10,263) (11,986)  
Assets, Transfers into Level 3 0 0  
Assets, Transfers out of Level 3 0 0  
Assets, Ending Balance 72,200 76,504  
Level 3 | Securities | Corporate debt securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 7,533 5,198  
Assets, Accreted Discounts/Amortized Premiums 0 0  
Assets, Realized Gain (Loss) (258) 1,535  
Assets, Change In Net Unrealized Gain/(Loss) 271 (1,508)  
Assets, Purchases 2,895 1,728  
Assets, Sales (2,094) (6,453)  
Assets, Transfers into Level 3 0 0  
Assets, Transfers out of Level 3 0 0  
Assets, Ending Balance 8,347 500  
Level 3 | Securities | Corporate equity securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 11,111 7,556  
Assets, Accreted Discounts/Amortized Premiums 0 0  
Assets, Realized Gain (Loss) 0 1,625  
Assets, Change In Net Unrealized Gain/(Loss) (40) (829)  
Assets, Purchases 31 4,127  
Assets, Sales 0 (2,638)  
Assets, Transfers into Level 3 0 0  
Assets, Transfers out of Level 3 0 0  
Assets, Ending Balance 11,102 9,841  
Level 3 | Loans      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Change in unrealized gain (loss), assets 225,500 (70,300)  
Level 3 | Loans | Residential mortgage loans      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 3,115,518 2,016,228  
Assets, Accreted Discounts/Amortized Premiums (1,662) (4,467)  
Assets, Realized Gain (Loss) (5,588) 1,511  
Assets, Change In Net Unrealized Gain/(Loss) 53,645 (70,512)  
Assets, Purchases 320,212 723,095  
Assets, Sales (457,381) (232,848)  
Assets, Transfers into Level 3 0 0  
Assets, Transfers out of Level 3 0 0  
Assets, Ending Balance 3,024,744 2,433,007  
Level 3 | Loans | Commercial mortgage loans      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 404,324 326,197  
Assets, Accreted Discounts/Amortized Premiums 0 0  
Assets, Realized Gain (Loss) (2) 10  
Assets, Change In Net Unrealized Gain/(Loss) 340 164  
Assets, Purchases 36,220 267,642  
Assets, Sales (66,649) (164,059)  
Assets, Transfers into Level 3 0 0  
Assets, Transfers out of Level 3 0 0  
Assets, Ending Balance 374,233 429,954  
Level 3 | Loans | Consumer loans      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 4,843 62,365  
Assets, Accreted Discounts/Amortized Premiums (246) (2,139)  
Assets, Realized Gain (Loss) 96 (180)  
Assets, Change In Net Unrealized Gain/(Loss) (254) (466)  
Assets, Purchases 300 10,946  
Assets, Sales (770) (60,648)  
Assets, Transfers into Level 3 0 0  
Assets, Transfers out of Level 3 0 0  
Assets, Ending Balance 3,969 9,878  
Level 3 | Loans | Corporate loan [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 4,086 10,531  
Assets, Accreted Discounts/Amortized Premiums 0 0  
Assets, Realized Gain (Loss) (100) 0  
Assets, Change In Net Unrealized Gain/(Loss) 1 0  
Assets, Purchases 936 1,650  
Assets, Sales (3) (393)  
Assets, Transfers into Level 3 0 0  
Assets, Transfers out of Level 3 0 0  
Assets, Ending Balance 4,920 11,788  
Level 3 | Loans | Reverse mortgage loans      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 8,097,237    
Assets, Accreted Discounts/Amortized Premiums 0    
Assets, Realized Gain (Loss) (3)    
Assets, Change In Net Unrealized Gain/(Loss) 171,567    
Assets, Purchases 420,478    
Assets, Sales (284,578)    
Assets, Transfers into Level 3 0    
Assets, Transfers out of Level 3 0    
Assets, Ending Balance 8,404,701    
Level 3 | Investment in unconsolidated entities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 127,046 195,643  
Assets, Accreted Discounts/Amortized Premiums 0 0  
Assets, Realized Gain (Loss) 1,472 878  
Assets, Change In Net Unrealized Gain/(Loss) 1,972 (6,384)  
Assets, Purchases 30,787 139,208  
Assets, Sales (42,530) (110,042)  
Assets, Transfers into Level 3 0 0  
Assets, Transfers out of Level 3 0 0  
Assets, Ending Balance 118,747 219,303  
Change in unrealized gain (loss), assets (1,900) (7,800)  
Level 3 | Financial Derivatives - Assets      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Change in unrealized gain (loss), assets   1  
Level 3 | Financial Derivatives - Assets | Credit default swaps on asset-backed securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 76 303  
Assets, Accreted Discounts/Amortized Premiums 0 0  
Assets, Realized Gain (Loss) 1 (4)  
Assets, Change In Net Unrealized Gain/(Loss) 0 1  
Assets, Purchases 0 4  
Assets, Sales (1) 0  
Assets, Transfers into Level 3 0 0  
Assets, Transfers out of Level 3 0 0  
Assets, Ending Balance 76 $ 304  
Level 3 | Mortgage servicing rights      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 8,108    
Assets, Accreted Discounts/Amortized Premiums 0    
Assets, Realized Gain (Loss) 0    
Assets, Change In Net Unrealized Gain/(Loss) (8)    
Assets, Purchases 0    
Assets, Sales 0    
Assets, Transfers into Level 3 0    
Assets, Transfers out of Level 3 0    
Assets, Ending Balance 8,100    
Change in unrealized gain (loss), assets (8)    
Level 3 | Servicing-related asset      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 999    
Assets, Accreted Discounts/Amortized Premiums 0    
Assets, Realized Gain (Loss) 0    
Assets, Change In Net Unrealized Gain/(Loss) (700)    
Assets, Purchases 0    
Assets, Sales 0    
Assets, Transfers into Level 3 0    
Assets, Transfers out of Level 3 0    
Assets, Ending Balance 299    
Change in unrealized gain (loss), assets (700)    
Level 3 | Loan commitments      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Assets, Beginning Balance 3,060    
Assets, Accreted Discounts/Amortized Premiums 0    
Assets, Realized Gain (Loss) 0    
Assets, Change In Net Unrealized Gain/(Loss) 239    
Assets, Purchases 0    
Assets, Sales 0    
Assets, Transfers into Level 3 0    
Assets, Transfers out of Level 3 0    
Assets, Ending Balance 3,299    
Change in unrealized gain (loss), assets $ 200