VARIABLE INTEREST ENTITIES - Summary of Unconsolidated VIEs (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Equipment, net of depreciation	$ 123,812	$ 128,021
Other assets	189,866	185,946
Total assets	7,738,106	7,828,410
Total unconsolidated liabilities	6,863,852	6,921,165
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Cash	3,101	4,224
Equipment, net of depreciation	242,988	248,920
Other assets	7,291	6,301
Total assets	253,380	259,445
Total unconsolidated liabilities	6,048	7,143
Maximum loss exposure	$ 27,786	$ 32,525