BASIS OF PRESENTATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment for adoption of financial instruments recognition and measurement changes	$ 0
Defined benefit plan net periodic benefit cost other than service cost component	1,900	$ 1,300
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment for adoption of financial instruments recognition and measurement changes	$ 66,234