SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Line Items]
Premium deficiency loss	$ 0	$ 0
Profit commission reserves	11,900	15,200
Profit commission expense, net	2,000	6,500	$ 7,500
Amount of notes receivable placed on non-accrual status	14,400	18,600
Accrued interest on notes receivable	100	0
Deposit assets	19,400
Deposit liabilities	28,100
Interest Expense, Other	600
Deposit Liabilities, Accrued Interest	200
Other Liabilities
Accounting Policies [Line Items]
Accrued bonuses	$ 6,400	$ 9,000
Minimum
Accounting Policies [Line Items]
Annual installment period to pay quantitative bonus	3 years
Maximum
Accounting Policies [Line Items]
Annual installment period to pay quantitative bonus	5 years