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STOCKHOLDERS' EQUITY (Treasury Stock) (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 22, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 31, 2015
Treasury Stock
Aggregate cost of shares repurchased during the period		$ 9,404	$ 6,019	$ 9,510
Treasury stock (in shares)		3,097,634	2,851,578
Stock Repurchase Program
Treasury Stock
Amount of stock repurchases authorized					$ 50,000
Number of shares repurchased during the period		246,056
Aggregate cost of shares repurchased during the period		$ 9,400
Amount available for repurchase		$ 22,300
Stock Repurchase Program | Subsequent Event
Treasury Stock
Number of shares repurchased during the period	29,385
Aggregate cost of shares repurchased during the period	$ 1,100
Amount available for repurchase	$ 21,200

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The cash outflow to reacquire common stock during the period.

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