Variable Interest Entities (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended
	Jul. 31, 2020	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Assets		$ 3,629,674	$ 3,629,674	$ 3,635,206
Loans receivable		227,047	227,047	232,344
Accounts payable and accrued expenses		(33,235)	(33,235)	(27,836)
CT Risk Management, LLC [Member]
Variable Interest Entity [Line Items]
Capital contribution	$ 14,800
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets		11,600	11,600
Loss on investment		3,200	3,200
Carrying Value | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Loans receivable		227,047	227,047	232,344
Financing receivables from affiliates		0	0	67,153
Equity method investment		10,236	10,236	1,761
Accounts payable and accrued expenses		(2,583)	(2,583)	(2,515)
Total		234,700	234,700	298,743
Maximum Exposure to Loss | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Loans receivable		293,847	293,847	335,255
Financing receivables from affiliates		0	0	67,153
Equity method investment		15,236	15,236	19,661
Accounts payable and accrued expenses		0	0	0
Total		$ 309,083	$ 309,083	$ 422,069