STOCKHOLDERS' EQUITY (Treasury Stock) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Treasury Stock
Aggregate cost of shares repurchased during the period	$ 201	$ 3,611
Stock Repurchase Program
Treasury Stock
Amount available for repurchase	$ 31,500		$ 31,700
Number of shares repurchased during the period	5,882
Aggregate cost of shares repurchased during the period	$ 200