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RETIREMENT PLANS: (Details 9) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in benefit obligation:
Benefit obligation at January 1	$ 98,096	$ 93,233
Service cost	1,388	1,432	$ 1,882
Interest cost	3,194	3,621	3,729
Actuarial (gain) loss	(10,618)	5,305
Defined Benefit Plan, Benefit Obligation, Benefits Paid	4,264	5,495
Benefit obligation at December 31	87,796	98,096	93,233
Funded status at December 31	(23,461)	(26,647)
Supplemental Employee Retirement Plans, Defined Benefit
Change in benefit obligation:
Benefit obligation at January 1	4,361	4,276
Service cost	42	53
Interest cost	131	172
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant	83	75
Actuarial (gain) loss	(872)	83
Defined Benefit Plan, Benefit Obligation, Benefits Paid	325	298
Benefit obligation at December 31	3,420	4,361	$ 4,276
Funded status at December 31	$ 3,420	$ 4,361

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- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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