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Investments (Details) - USD ($)		3 Months Ended			6 Months Ended
	Jan. 01, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Interest and Dividend Income, Securities, Operating, Available-for-sale					$ 300,000
Proceeds from Sale of Debt Securities, Available-for-sale			$ 39,600,000		0	$ 39,635,000
Debt and Equity Securities, Gain (Loss)			8,000
Investments in beneficial interests		$ 69,876,000			69,876,000		$ 57,954,000
Investment In Securities		0	20,200,000		61,300,000	84,200,000
Investments at fair value		257,990,000			257,990,000		231,685,000
Provision for credit losses	$ 10,200,000	0	0		(10,156,000)	0
Reversal of / (Increase in) provision for credit losses on beneficial interests					(184,000)	0
Debt Securities		257,990,000			257,990,000		231,685,000
Oileus Residential Loan Trust
Debt Securities, Available-for-sale [Line Items]
Available-for-sale Securities, Gross Realized Gains				$ 0
Beneficial interests
Debt Securities, Available-for-sale [Line Items]
Provision for credit losses	$ 4,200,000
Reversal of / (Increase in) provision for credit losses on beneficial interests		2,802,000	0		(185,000)	0
Senior Notes
Debt Securities, Available-for-sale [Line Items]
Investment in senior notes			$ 7,500,000		49,600,000	$ 57,500,000
Beneficial interests
Debt Securities, Available-for-sale [Line Items]
Investment in beneficial interests - Gross unrealized gains		0			0		0
Investment in beneficial interests - Gross unrealized loss		0			0		0
Accumulated Net Investment Gain (Loss) Attributable to Noncontrolling Interest
Debt Securities, Available-for-sale [Line Items]
Investment in beneficial interests - Gross unrealized gains		2,936,000			2,936,000		1,643,000
Investment in beneficial interests - Gross unrealized loss		$ (6,872,000)			$ (6,872,000)		$ (366,000)

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