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VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Variable Interest Entity [Line Items]    
Cash and cash equivalents $ 220,819 $ 373,472
Equipment, net of depreciation 121,520 128,021
Other assets 194,014 185,946
Total assets 7,877,334 7,828,410
Total unconsolidated liabilities 6,980,127 6,921,165
Variable Interest Entity, Not Primary Beneficiary    
Variable Interest Entity [Line Items]    
Cash and cash equivalents 3,228 4,224
Equipment, net of depreciation 241,015 248,920
Other assets 7,470 6,301
Total assets 251,713 259,445
Total unconsolidated liabilities 6,357 7,143
Maximum loss exposure $ 27,977 $ 32,525