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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Principles of Consolidation (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Assets | $ 3,900,106 | $ 4,075,969
Liabilities | 2,095,458 | 2,387,666
Variable Interest Entity |  |
Variable Interest Entity [Line Items] |  |
Assets | 49,200 | 392,000
Liabilities | $ 21,600 | $ 255,600

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