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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Equipment, net of depreciation $ 118,649 $ 121,520
Other assets 193,570 195,119
Total assets 8,027,413 7,877,334
Total unconsolidated liabilities 7,198,051 6,980,127
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Cash 2,503 3,228
Equipment, net of depreciation 236,952 241,015
Other assets 8,116 7,470
Total assets 247,571 251,713
Total unconsolidated liabilities 6,186 6,357
Maximum loss exposure $ 24,068 $ 27,977