Variable Interest Entities ("VIEs") (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entities
Assets	$ 16,207,165	$ 16,187,665
Total liabilities	9,829,855	9,843,931
Unconsolidated VIEs
Variable Interest Entities
Assets	115,386	109,220
Guarantor obligations, maximum exposure, undiscounted	183,476	196,394
Consolidated VIEs
Variable Interest Entities
Assets	4,887,050	4,901,150
Total liabilities	$ 2,733,197	$ 2,735,826