VARIABLE INTEREST ENTITIES - Others' Interest in Equity of Consumer Loan Companies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Total consolidated equity	$ 6,669,380	$ 5,429,684	$ 7,236,260	$ 6,088,295
Others’ interest in equity of consolidated subsidiary	65,348	108,668
Net income (loss)	805,582	(1,357,684)	605,933
Noncontrolling interests in income of consolidated subsidiaries	33,356	52,674	42,637
VIE, consolidated | Advance Purchaser LLC
Noncontrolling Interest [Line Items]
Total consolidated equity	95,995	163,944
Others’ interest in equity of consolidated subsidiary	10,251	43,882
Net income (loss)	(13,937)	3,326	15,892
Noncontrolling interests in income of consolidated subsidiaries	(1,800)	891	4,255
VIE, consolidated | Shelter Joint Ventures
Noncontrolling Interest [Line Items]
Total consolidated equity	31,684	38,727
Others’ interest in equity of consolidated subsidiary	15,683	19,402
Net income (loss)	22,839	31,188	12,717
Noncontrolling interests in income of consolidated subsidiaries	11,298	15,625	6,231
VIE, consolidated | Consumer Loan SPVs
Noncontrolling Interest [Line Items]
Total consolidated equity	83,597	96,418
Others’ interest in equity of consolidated subsidiary	39,414	45,384
Net income (loss)	51,307	77,760	69,143
Noncontrolling interests in income of consolidated subsidiaries	$ 23,858	$ 36,158	$ 32,151
VIE, consolidated | Advance Purchaser LLC
Noncontrolling Interest [Line Items]
Others’ ownership interest	10.70%	26.80%
Ownership percentage	89.30%	73.20%	73.20%
VIE, consolidated | Shelter Joint Ventures
Noncontrolling Interest [Line Items]
Others’ ownership interest	49.50%	50.10%
VIE, consolidated | Consumer Loan SPVs
Noncontrolling Interest [Line Items]
Others’ ownership interest	46.50%	46.50%
Weighted Average | VIE, consolidated | Advance Purchaser LLC
Noncontrolling Interest [Line Items]
Others’ ownership interest	12.90%	26.80%	26.80%
Weighted Average | VIE, consolidated | Shelter Joint Ventures
Noncontrolling Interest [Line Items]
Others’ ownership interest	49.50%	50.10%	49.00%
Weighted Average | VIE, consolidated | Consumer Loan SPVs
Noncontrolling Interest [Line Items]
Others’ ownership interest	46.50%	46.50%	46.50%