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Investments - Narrative (Details) - USD ($)			3 Months Ended		6 Months Ended
		Jan. 01, 2020	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Gross unrealized gains			$ 1,900,000		$ 1,900,000		$ 1,200,000
Gross unrealized loss			200,000		200,000		800,000
Carrying value (fair value)			424,600,000		424,600,000		273,800,000
Investment In securities			232,900,000	$ 0	232,900,000	$ 61,300,000
Provision for credit losses		$ 10,200,000
Financial Asset, Past Due
Debt Securities, Available-for-sale [Line Items]
Securities past due			0		0		0
Beneficial interests in securitization trusts
Debt Securities, Available-for-sale [Line Items]
Provision for credit losses		$ (1,700,000)
Reversal of provision for credit losses			2,000,000.0	$ 3,100,000	2,000,000.0	200,000
Beneficial interests in securitization trusts
Debt Securities, Available-for-sale [Line Items]
Investment in subordinate notes					39,500,000
Investment in beneficial interests			39,500,000			7,100,000
Senior notes
Debt Securities, Available-for-sale [Line Items]
Investment in senior notes			170,000,000.0		170,000,000.0	49,600,000
Subordinated debt
Debt Securities, Available-for-sale [Line Items]
Investment in subordinate notes			23,500,000		23,500,000	$ 4,600,000
Beneficial interests in securitization trusts
Debt Securities, Available-for-sale [Line Items]
Gross unrealized gains			0		0		0
Gross unrealized loss			0		0		0
Carrying value (fair value)	[1]		133,484,000		133,484,000		91,418,000
Debt securities
Debt Securities, Available-for-sale [Line Items]
Gross unrealized gains			1,877,000		1,877,000		1,152,000
Gross unrealized loss			226,000		226,000		777,000
Accumulated net investment gain (loss) attributable to noncontrolling interest
Debt Securities, Available-for-sale [Line Items]
Gross unrealized gains			1,877,000		1,877,000		1,152,000
Gross unrealized loss			$ 226,000		$ 226,000		$ 777,000
[1] Investments in beneficial interests includes allowance for credit losses of $3.0 million and $4.5 million at June 30, 2021 and December 31, 2020, respectively.

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