OTHER INCOME (EXPENSE) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Income and Expenses [Abstract]
Equity earnings in affiliates	$ 1,200	$ 795
Other income	1,243	956
Other components of net periodic pension income	1,008	2,079
Total Other income (expense)	$ 3,451	$ 3,830