SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Principles of Consolidation (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Assets	$ 3,846,196	$ 3,900,106
Liabilities	2,144,977	2,095,458
Variable Interest Entity
Variable Interest Entity [Line Items]
Assets	46,500	49,200
Liabilities	$ 21,000	$ 21,600