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RETIREMENT PLANS: (Details 12) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($)
Retirement Benefits [Abstract] |
Effect on total of service and interest cost components 1% Point Increase | $ 1
Effect on total of service and interest cost components 1% Point Decrease | 1
Effect on post-retirement benefit obligation 1% Point Increase | 17
Effect on post-retirement benefit obligation 1% Point Decrease | $ 16

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- Definition Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate. + 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 (m) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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