EMPLOYEE LOANS AND ALLOWANCE FOR LOAN LOSSES (Employee Loans Rollforward) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017
Loans and Leases Receivable, Related Parties [Roll Forward]
Balance, beginning of period	$ 5,978	$ 6,338	$ 6,515
Employee loans issued	1,875	2,960	3,427
Employee loans repaid	(3,615)	(3,273)	(3,547)
Employee loans written-off	(22)		(7)
Changes in interest and penalties accrued	(18)	(35)	(32)
Effect of net foreign currency exchange rate changes	12	(12)	(18)
Balance, end of period	$ 5,978	$ 6,338	$ 6,515	$ 4,210