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RETIREMENT PLANS: (Details 11) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | $ 1,300 | $ 1,218 | $ 1,388
Interest cost | 3,116 | 3,465 | 3,194
Recognized actuarial loss | 6,845 | 14,233 |
Net periodic pension cost | 2,186 | 2,656 | 2,068
Net loss (gain) during the period | 3,188 | 6,362 | (1,192)
Amortization of prior service cost | (1) | (1) | (1)
Total recognized in other comprehensive income (loss) | 1,220 | 4,803 | (2,640)
Total recognized net periodic pension cost and other comprehensive income | 3,406 | 7,459 | (572)
Postretirement Health Coverage [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 38 | 34 | 42
Interest cost | 125 | 146 | 131
Amortization of net actuarial loss (gain) | 0 | (16) | 0
Net periodic pension cost | 163 | 164 | 173
Net loss (gain) during the period | 238 | 626 | (872)
Amortization of prior service cost | 0 | 16 | 0
Total recognized in other comprehensive income (loss) | 238 | 642 | (872)
Total recognized net periodic pension cost and other comprehensive income | $ 401 | $ 806 | $ (699)

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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