INVESTMENTS IN CONSUMER LOANS - Carrying Value of Performing Loans (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Loans Receivable [Roll Forward]
Purchases	$ 585,983	$ 319
Proceeds from repayments	(59,673)	(31,092)
Accretion of loan discount and premium amortization, net	811,922	$ 514,522
Performing Loans
Loans Receivable [Roll Forward]
Purchases			$ 176,200
Consumer Portfolio Segment \| Performing Loans
Loans Receivable [Roll Forward]
Beginning balance	1,482,954
Purchases	0
Additional fundings	41,930
Proceeds from repayments	(256,210)
Accretion of loan discount and premium amortization, net	3,987
Gross charge-offs	(56,569)
Additions to the allowance for loan losses, net	(2,164)
Ending balance	$ 1,213,928		$ 1,482,954

Allowance for Loan Losses, Net

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- Definition

Financing Receivable, Additional Funding Receivable

+ References

No definition available.

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- Definition

Loans Receivable [Roll Forward]

+ References

No definition available.

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- Definition

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (SX 210.9-03.7)
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- Definition

The cash outflow associated with purchasing loans held for investment purposes during the period.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The cash inflow from repayments of the balance excluding interest (principal) on loans receivable and leases held for investment purposes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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