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RETIREMENT PLANS: (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Retirement Benefits [Abstract]
Net loss (gain)	$ 22,982	$ 25,621
Prior service cost (credit)			$ 1
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax	2	3
Pension and other postretirement benefit plans, adjustment	$ 22,984	$ 25,624

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Amount, before tax, after reclassification adjustment, of increase (decrease) in accumulated other comprehensive income from gain (loss) of defined benefit plan.

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