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BENEFIT PLANS: (Details) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) plan | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Benefit plans |  |  |
Number of noncontributory defined benefit pension plans | plan | 2 |  |
Maximum |  |  |
Defined benefit plan, net periodic benefit costs |  |  |
Amortization of net loss (gain) | $ (0.1) |  | $ (0.1)
Post retirement defined benefit plans and defined contribution plan |  |  |
Defined benefit plan, net periodic benefit costs |  |  |
Service cost | 0.5 | $ 0.5 |
Interest cost | 0.9 | 0.8 |
Expected return on plan assets | (1.7) | (1.8) |
Amortization of net loss (gain) | 0.1 | 0.1 |
Amortization of prior service cost (credit) | 0.1 | 0.1 |
Net periodic benefit cost | (0.1) | (0.3) |
Post-retirement Health care plans |  |  |
Defined benefit plan, net periodic benefit costs |  |  |
Interest cost | 0.5 | 0.5 |
Amortization of net loss (gain) | (0.1) | (0.1) |
Net periodic benefit cost | 0.4 | 0.4 |
Post-retirement Health care plans | Maximum |  |  |
Defined benefit plan, net periodic benefit costs |  |  |
Amortization of prior service cost (credit) | $ 0.1 | $ 0.1 |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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