FINANCING RECEIVABLES - Percentage Breakout of Gross Financing Receivables (Details)	Dec. 31, 2017	Dec. 31, 2016
Percentage of period-end gross financing receivables
Current	93.70%	92.50%
30-59 days past due	2.90%	3.90%
60-89 days past due	0.90%	1.00%
90 days or more past due	2.50%	2.60%
Total	100.00%	100.00%

Financing Receivable, Percentage of Recorded Investment, 30 to 59 Days Past Due

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Financing Receivable, Percentage of Recorded Investment, 60 to 89 Days Past Due

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Financing Receivable Percentage of Recorded Investment Current

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Financing Receivable, Percentage of Recorded Investment, Equal to Greater than 90 Days Past Due

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Financing Receivable, Percentage of Recorded Investment, Past Due

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Financing Receivable, Percentage of Recorded Investment Past Due [Abstract]

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