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RETIREMENT PLANS: (Details 11) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 1,218 | $ 1,388 | $ 1,432
Interest cost | 3,465 | 3,194 | 3,621
Recognized actuarial loss | 14,233 | (10,618) |
Net periodic pension cost | 2,656 | 2,068 | 2,318
Net loss (gain) during the period | 6,362 | (1,192) | 5,366
Amortization of prior service cost | (1) | (1) | (1)
Total recognized in other comprehensive income (loss) | 4,803 | (2,640) | 4,161
Total recognized net periodic pension cost and other comprehensive income | 7,459 | (572) | 6,479
Postretirement Health Coverage [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 34 | 42 | 53
Interest cost | 146 | 131 | 172
Amortization of net actuarial loss (gain) | (16) | 0 | 0
Net periodic pension cost | 164 | 173 | 225
Net loss (gain) during the period | 626 | (872) | 83
Amortization of prior service cost | 16 | 0 | 0
Total recognized in other comprehensive income (loss) | 642 | (872) | 83
Total recognized net periodic pension cost and other comprehensive income | $ 806 | $ (699) | $ 308

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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