INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
U.S. corporate income tax rate			21.00%		35.00%
Estimated annual effective tax rate (in Percent)	22.50%	35.10%	22.50%	35.10%
Excess tax benefit from share-based compensation	$ 69	$ 1,007	$ 931	$ 3,714
Changes in valuation allowances			$ 93
Effective income tax rate (in Percent)	22.30%	29.80%	20.70%	29.50%
Net operating loss carryforwards for state tax purposes					$ 27,948
Operating loss carryforwards expiration beginning year, state			2025
Gross unrecognized tax benefits, total	$ 147		$ 147		131
Unrecognized tax benefits effecting income tax rate, if recognized	$ 116		$ 116		$ 103