EMPLOYEE BENEFITS (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Plan with Benefit Obligation in Excess of Plan Assets [Abstract]
Projected benefit obligations	$ 242,309	$ 230,724
Fair value of plan assets	194,554	173,259
Excess of projected benefit obligations over plan assets	47,755	57,465
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]
Accumulated benefit obligation	238,368	227,145
Fair value of plan assets	193,848	172,641
Excess of accumulated benefit obligations over plan assets	$ 44,520	$ 54,504