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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Equipment, net of depreciation $ 114,011 $ 121,520
Other assets 224,721 195,119
Total assets 8,278,741 7,877,334
Total unconsolidated liabilities 7,433,938 6,980,127
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Cash 3,109 3,228
Equipment, net of depreciation 234,972 241,015
Other assets 8,715 7,470
Total assets 246,796 251,713
Total unconsolidated liabilities 6,230 6,357
Maximum loss exposure $ 25,196 $ 27,977