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RETIREMENT PLANS: (Details 11) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 1,355 | $ 1,300 | $ 1,218
Interest cost | 2,632 | 3,116 | 3,465
Recognized actuarial loss | (2,943) | 6,845 |
Net periodic pension cost | 1,346 | 2,186 | 2,656
Net loss (gain) during the period | (5,883) | 3,188 | 6,362
Amortization of prior service cost | (1) | (1) | (1)
Total recognized in other comprehensive income (loss) | (7,956) | 1,220 | 4,803
Total recognized net periodic pension cost and other comprehensive income | (6,610) | 3,406 | 7,459
Postretirement Health Coverage [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 43 | 38 | 34
Interest cost | 103 | 125 | 146
Amortization of net actuarial loss (gain) | 0 | 0 | (16)
Net periodic pension cost | 146 | 163 | 164
Net loss (gain) during the period | (53) | 238 | 626
Amortization of prior service cost | 0 | 0 | 16
Total recognized in other comprehensive income (loss) | (53) | 238 | 642
Total recognized net periodic pension cost and other comprehensive income | $ 93 | $ 401 | $ 806

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