EMPLOYEE BENEFIT PLANS Pension Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Pension and Other Postretirement Benefit Expense	$ 11,849	$ (434)	$ 8,910
Service cost	4,602	5,242	4,328
Interest cost	4,362	4,137	3,912
Expected return on plan assets	(5,695)	(5,969)	(5,562)
Defined Benefit Plan, Amortization of Gain (Loss)	(63)	(46)	(149)
Total net periodic pension cost	3,206	3,364	2,529
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	11,523	(5,250)	8,593
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	63	46	149
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	11,586	(5,204)	8,742
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	(2,943)	1,406	(2,361)
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	$ 8,643	$ (3,798)	$ 6,381