Variable Interest Entities (VIEs) (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Variable Interest Entities
Assets	$ 17,152,421	$ 17,266,588
Total liabilities	9,995,599	10,062,667
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities
Assets	68,894	69,435
Variable Interest Entity, Primary Beneficiary
Variable Interest Entities
Assets	4,563,905	4,564,621
Total liabilities	$ 2,366,989	$ 2,517,652