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RETIREMENT PLANS: (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Retirement Benefits [Abstract] |  |
Net loss (gain) | $ 21,051 | $ 29,006
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Reclassification Adjustment, before Tax | 0 | 1
Pension and other postretirement benefit plans, adjustment | $ 21,051 | $ 29,007

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