INCOME TAXES (SOURCES OF PRE-TAX INCOME TABLE) (DETAILS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Sources of pre-tax accounting income
Domestic	$ 10,909	$ (6,216)	$ 25,402
Foreign	77,978	56,514	60,487
Income before income taxes	$ 88,887	$ 50,298	$ 85,889