Variable Interest Entities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Variable Interest Entity [Line Items]
Assets	$ 7,535,944	$ 7,360,171	$ 7,920,781
Liabilities	6,127,378	5,995,236
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Assets	242,000	225,100
Liabilities	79,100	74,800
Obligations payable	$ 163,400	$ 150,300