INVESTMENTS IN CONSUMER LOANS - Carrying Value of Performing Consumer Loans (Details) - USD ($) $ in Thousands		1 Months Ended	9 Months Ended		12 Months Ended
		Aug. 31, 2016	Dec. 31, 2016		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans Receivable [Roll Forward]
Purchases					$ 191,081	$ 290,652	$ 884,557
Accretion of loan discount and premium amortization, net					747,932	525,298	$ 278,408
Performing Loans [Member]
Loans Receivable [Roll Forward]
Purchases		$ 140,000			176,200
Consumer Portfolio Segment [Member] | Performing Loans [Member]
Loans Receivable [Roll Forward]
Beginning balance					0
SpringCastle Transaction					1,539,569
Purchases					176,107
Additional fundings	[1]				49,289
Proceeds from repayments					(239,236)
Accretion of loan discount and premium amortization, net					7,728
Net charge-offs			$ (47,065)	[2]	(47,065)
Provision for loan losses			(50,503)		(3,438)
Ending balance			$ 1,482,954		$ 1,482,954	$ 0

[1] Represents draws on consumer loans with revolving privileges.

[2] Consumer loans, other than PCD loans, are charged off when available information confirms that loans are uncollectible, which is generally when they become 180 days past due. Charge-offs are presented net of $8.1 million in recoveries of previously charged-off UPB.