STOCKHOLDERS' EQUITY - Reclass (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Unrecognized Net Periodic Benefit Credit
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	$ 135	$ 56
Tax benefit (expense)	(35)	(14)
Total, net of tax	100	42
Amortization of net actuarial gain
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax	$ 135	145
Pension settlement expense, including termination expense
Significant reclassifications out of accumulated other comprehensive loss by component
Total, pre-tax		$ (89)