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EMPLOYEE BENEFIT PLANS - Changes in plan assets and benefit obligations (Details) - Defined Benefit Pension Items [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OTHER CHANGES IN PLAN ASSETS AND BENEFIT OBLIGATIONS RECOGNIZED IN OTHER COMPREHENSIVE LOSS
Net (gain) loss	$ 5,300	$ 4,683	$ (822)
Recognized loss	(1,649)	(1,548)	(1,454)
Total recognized in other comprehensive loss before tax effect	3,651	3,135	(2,276)
Total recognized in net benefit cost and other comprehensive loss before tax effect	$ 5,314	$ 4,703	$ (553)

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The net gain or loss for the defined benefit plan for the period recognized in other comprehensive income.

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Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss.

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