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Fair Value - Schedule of Assets and Liabilities at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Financial assets    
Mortgage loans held-for-sale, net $ 31,315 $ 55,718
Investment in debt securities held-to-maturity 45,058 59,173
Financial liabilities    
Borrowings under repurchase transactions 231,464 375,745
Level 1 - Quoted prices in active markets    
Financial assets    
Mortgage loans held-for-investment, net 0 0
Mortgage loans held-for-sale, net 0 0
Investment in debt securities held-to-maturity 0 0
Financial liabilities    
Secured borrowings, net 0 0
Borrowings under repurchase transactions 0 0
Convertible senior notes   101,777
Notes payable, net 0 0
Level 1 - Quoted prices in active markets | Investment in other affiliates    
Financial assets    
Investments, fair value disclosure   0
Level 1 - Quoted prices in active markets | Investment in Former Manager    
Financial assets    
Investments, fair value disclosure 0 0
Level 1 - Quoted prices in active markets | Investment in Gaea    
Financial assets    
Investments, fair value disclosure   0
Level 1 - Quoted prices in active markets | Investment in beneficial interests    
Financial assets    
Investments, fair value disclosure 0 0
Level 2 - Observable inputs other than Level 1 prices    
Financial assets    
Mortgage loans held-for-investment, net 0 0
Mortgage loans held-for-sale, net 0 0
Investment in debt securities held-to-maturity 45,058 59,173
Financial liabilities    
Secured borrowings, net 247,601 370,882
Borrowings under repurchase transactions 231,464 375,745
Convertible senior notes   0
Notes payable, net 110,100 103,697
Level 2 - Observable inputs other than Level 1 prices | Investment in other affiliates    
Financial assets    
Investments, fair value disclosure   2,335
Level 2 - Observable inputs other than Level 1 prices | Investment in Former Manager    
Financial assets    
Investments, fair value disclosure 0 0
Level 2 - Observable inputs other than Level 1 prices | Investment in Gaea    
Financial assets    
Investments, fair value disclosure   0
Level 2 - Observable inputs other than Level 1 prices | Investment in beneficial interests    
Financial assets    
Investments, fair value disclosure 0 0
Level 3 - Unobservable inputs    
Financial assets    
Mortgage loans held-for-investment, net 366,296 770,419
Mortgage loans held-for-sale, net 31,315 60,444
Investment in debt securities held-to-maturity 0 0
Financial liabilities    
Secured borrowings, net 0 0
Borrowings under repurchase transactions 0 0
Convertible senior notes   0
Notes payable, net 0 0
Level 3 - Unobservable inputs | Investment in other affiliates    
Financial assets    
Investments, fair value disclosure   674
Level 3 - Unobservable inputs | Investment in Former Manager    
Financial assets    
Investments, fair value disclosure 538 4,527
Level 3 - Unobservable inputs | Investment in Gaea    
Financial assets    
Investments, fair value disclosure   21,678
Level 3 - Unobservable inputs | Investment in beneficial interests    
Financial assets    
Investments, fair value disclosure 64,185 81,316
Carrying value    
Financial assets    
Mortgage loans held-for-investment, net 403,056 864,551
Mortgage loans held-for-sale, net 31,315 55,718
Investment in debt securities held-to-maturity 47,144 59,691
Financial liabilities    
Secured borrowings, net 266,776 411,212
Borrowings under repurchase transactions 231,464 375,745
Convertible senior notes   103,516
Notes payable, net 107,432 106,844
Carrying value | Investment in other affiliates    
Financial assets    
Investments, fair value disclosure   5,319
Carrying value | Investment in Former Manager    
Financial assets    
Investments, fair value disclosure 538 440
Carrying value | Investment in Gaea    
Financial assets    
Investments, fair value disclosure   22,241
Carrying value | Investment in beneficial interests    
Financial assets    
Investments, fair value disclosure $ 88,996 $ 104,162