Variable Interest Entities ("VIEs") (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Variable Interest Entities
Assets	$ 16,452,543	$ 16,493,375
Total liabilities	9,909,318	9,980,263
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities
Assets	110,408	68,223
Variable Interest Entity, Primary Beneficiary
Variable Interest Entities
Assets	5,036,892	4,423,995
Total liabilities	$ 2,763,077	$ 2,345,726