INCOME TAXES (Narrative) (Details) - USD ($) $ in Thousands			12 Months Ended
	Dec. 22, 2017	Dec. 21, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal statutory income tax rate, percent	21.00%	35.00%
Effective income taxes			31.40%	25.70%	25.80%
Tax credits			$ 858	$ 1,973	$ 913
Tax expense due to the tax act			6,250	$ 0	$ 0
Minimum
Tax expense due to the tax act			5,000
Maximum
Tax expense due to the tax act			$ 8,000