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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Variable Interest Entity [Line Items]    
Equipment, net of depreciation $ 120,071 $ 121,520
Other assets 185,900 195,119
Total assets 7,933,459 7,877,334
Total unconsolidated liabilities 7,128,766 6,980,127
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Cash 4,469 3,228
Equipment, net of depreciation 239,043 241,015
Other assets 7,708 7,470
Total assets 251,220 251,713
Total unconsolidated liabilities 6,347 6,357
Maximum loss exposure $ 23,809 $ 27,977