Annual report pursuant to Section 13 and 15(d)

FINANCING RECEIVABLES - Financing Receivables and Allowance (Details)

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FINANCING RECEIVABLES - Financing Receivables and Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Financed receivables include installment receivable amounts which are due subsequent to one year    
Gross financing receivables, short-term $ 18,798 $ 17,695
Gross financing receivables, long-term 21,771 18,178
Allowance for doubtful accounts (2,892) (3,157)
Net financing receivables 37,677 32,716
Financing Receivable, Allowance for Credit Losses [Roll Forward]    
Balance, beginning of period 3,157 3,288
Additions to allowance 1,424 890
Deductions, net of recoveries (1,689) (1,021)
Balance, end of period $ 2,892 $ 3,157