INVESTMENTS IN CONSUMER LOANS - Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Noncontrolling Interest [Line Items]
Total Consumer Loan Companies equity	$ 4,571,612		$ 4,571,612		$ 3,260,100
Others’ interests in equity of consolidated subsidiary	107,592		107,592		208,077
Noncontrolling interests in income (loss) of consolidated subsidiaries	13,600	$ 32,178	45,051	$ 61,355
Consumer Loan Companies
Noncontrolling Interest [Line Items]
Total Consumer Loan Companies equity	73,720		73,720		$ 75,311
Net Consumer Loan Companies income (loss)	$ 26,616	$ 28,655	$ 74,580	$ 60,118
Consumer Loan Companies
Noncontrolling Interest [Line Items]
Others’ ownership interest	46.50%	46.50%	46.50%	46.50%	46.50%
Others’ interests in equity of consolidated subsidiary	$ 34,276		$ 34,276		$ 35,020
Noncontrolling interests in income (loss) of consolidated subsidiaries	$ 12,376	$ 13,325	$ 34,679	$ 27,955