STOCKHOLDERS' EQUITY (Reclass) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Unrecognized Net Periodic Benefit Costs
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	$ (2,600)	$ (4,637)
Tax benefit	669	1,804
Total, net of tax	(1,931)	(2,833)
Amortization of net actuarial loss
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	(1,562)	(2,031)
Amortization of prior service credit
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	47	95
Pension settlement expense
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	$ (1,085)	$ (2,701)