FINANCIAL INSTRUMENTS - Summary of Assets and Liabilities Not Measured At Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial assets:
Restricted cash	$ 17,656	$ 12,117
Carrying Value
Financial assets:
Cash	130,739	162,374
Restricted cash	17,656	12,117
Loans receivable, net	328,952	363,269
Investment	6,600	5,600
Financial liabilities:
Credit services organization guarantee liability	10,412	17,795
Carrying Value | 12% Senior Secured Notes
Financial liabilities:
Senior secured notes	511,493	585,823
Carrying Value | Non-Recourse U.S. SPV Facility
Financial liabilities:
Senior secured notes	111,151	120,402
Carrying Value | Senior Revolver
Financial liabilities:
Senior secured notes	0
Estimated Fair Value
Financial assets:
Cash	130,739	162,374
Restricted cash	17,656	12,117
Loans receivable, net	328,952	363,269
Investment	6,600	5,600
Financial liabilities:
Credit services organization guarantee liability	10,412	17,795
Estimated Fair Value | 12% Senior Secured Notes
Financial liabilities:
Senior secured notes	583,406	663,472
Estimated Fair Value | Non-Recourse U.S. SPV Facility
Financial liabilities:
Senior secured notes	115,071	124,590
Estimated Fair Value | Senior Revolver
Financial liabilities:
Senior secured notes	0
Estimated Fair Value | Level 1
Financial assets:
Cash	130,739	162,374
Restricted cash	17,656	12,117
Loans receivable, net	0	0
Investment	0	0
Financial liabilities:
Credit services organization guarantee liability	0	0
Estimated Fair Value | Level 1 | 12% Senior Secured Notes
Financial liabilities:
Senior secured notes	0	0
Estimated Fair Value | Level 1 | Non-Recourse U.S. SPV Facility
Financial liabilities:
Senior secured notes	0	0
Estimated Fair Value | Level 1 | Senior Revolver
Financial liabilities:
Senior secured notes	0
Estimated Fair Value | Level 2
Financial assets:
Cash	0	0
Restricted cash	0	0
Loans receivable, net	0	0
Investment	0	0
Financial liabilities:
Credit services organization guarantee liability	0	0
Estimated Fair Value | Level 2 | 12% Senior Secured Notes
Financial liabilities:
Senior secured notes	0	0
Estimated Fair Value | Level 2 | Non-Recourse U.S. SPV Facility
Financial liabilities:
Senior secured notes	0	0
Estimated Fair Value | Level 2 | Senior Revolver
Financial liabilities:
Senior secured notes	0
Estimated Fair Value | Level 3
Financial assets:
Cash	0	0
Restricted cash	0	0
Loans receivable, net	328,952	363,269
Investment	6,600	5,600
Financial liabilities:
Credit services organization guarantee liability	10,412	17,795
Estimated Fair Value | Level 3 | 12% Senior Secured Notes
Financial liabilities:
Senior secured notes	583,406	663,472
Estimated Fair Value | Level 3 | Non-Recourse U.S. SPV Facility
Financial liabilities:
Senior secured notes	115,071	$ 124,590
Estimated Fair Value | Level 3 | Senior Revolver
Financial liabilities:
Senior secured notes	$ 0