FAIR VALUE MEASUREMENTS - Schedule of Variable Interest Entities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Other investments, maximum exposure to loss	$ 2,542,711	$ 2,064,878
Carrying amount
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Other investments, maximum exposure to loss	1,140,450	916,248
Unfunded Commitments
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Other investments, maximum exposure to loss	$ 1,402,261	$ 1,148,630