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RETIREMENT BENEFIT OBLIGATIONS (Tables) | 9 Months Ended
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Sep. 30, 2018
Key Weighted Average Assumptions Used in Determining Benefit Plan Costs and Obligations | The following table includes the key weighted average assumptions used in determining the Company’s benefit plan costs and obligations:
|  | 2018 |  |  | 2017 |
Used to Determine Plan Costs |  |  |  |  |  |  |  |
Discount Rate |  |  | 3.60 | % |  |  | 4.10 | %
Rate of Compensation Increase |  |  | 3.00 | % |  |  | 3.00 | %
Expected Long-term rate of return on plan assets |  |  | 7.75 | % |  |  | 7.75 | %
Health Care Cost Trend Rate Assumed for Next Year |  |  | 7.50 | % |  |  | 8.00 | %
Ultimate Health Care Cost Trend Rate |  |  | 4.50 | % |  |  | 4.00 | %
Year that Ultimate Health Care Cost Trend Rate is reached |  |  | 2024 |  |  |  | 2025 |
Components of Retirement Plan Costs | The following tables provide the components of the Company’s Retirement plan costs ($000’s):
|  | Pension Plan |  |  | PBOP Plan |  |  | SERP |
Three Months Ended September 30, |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service Cost |  | $ | 848 |  |  | $ | 824 |  |  | $ | 733 |  |  | $ | 744 |  |  | $ | 122 |  |  | $ | 115 |
Interest Cost |  |  | 1,469 |  |  |  | 1,514 |  |  |  | 852 |  |  |  | 978 |  |  |  | 101 |  |  |  | 98 |
Expected Return on Plan Assets |  |  | (1,946 | ) |  |  | (1,826 | ) |  |  | (409 | ) |  |  | (337 | ) |  |  | — |  |  |  | — |
Prior Service Cost Amortization |  |  | 81 |  |  |  | 66 |  |  |  | 327 |  |  |  | 350 |  |  |  | 47 |  |  |  | 47 |
Actuarial Loss Amortization |  |  | 1,447 |  |  |  | 1,165 |  |  |  | 346 |  |  |  | 524 |  |  |  | 121 |  |  |  | 74 |
Sub-total |  |  | 1,899 |  |  |  | 1,743 |  |  |  | 1,849 |  |  |  | 2,259 |  |  |  | 391 |  |  |  | 334 |
Amounts Capitalized and Deferred |  |  | (962 | ) |  |  | (932 | ) |  |  | (930 | ) |  |  | (1,226 | ) |  |  | (113 | ) |  |  | (99 | )
Net Periodic Benefit Cost Recognized |  | $ | 937 |  |  | $ | 811 |  |  | $ | 919 |  |  | $ | 1,033 |  |  | $ | 278 |  |  | $ | 235 |
|  | Pension Plan |  |  | PBOP Plan |  |  | SERP |
Nine Months Ended September 30, |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service Cost |  | $ | 2,544 |  |  | $ | 2,471 |  |  | $ | 2,199 |  |  | $ | 2,231 |  |  | $ | 366 |  |  | $ | 345 |
Interest Cost |  |  | 4,407 |  |  |  | 4,543 |  |  |  | 2,554 |  |  |  | 2,935 |  |  |  | 303 |  |  |  | 294 |
Expected Return on Plan Assets |  |  | (5,838 | ) |  |  | (5,479 | ) |  |  | (1,227 | ) |  |  | (1,010 | ) |  |  | — |  |  |  | — |
Prior Service Cost Amortization |  |  | 243 |  |  |  | 197 |  |  |  | 981 |  |  |  | 1,049 |  |  |  | 141 |  |  |  | 141 |
Actuarial Loss Amortization |  |  | 4,341 |  |  |  | 3,496 |  |  |  | 1,038 |  |  |  | 1,573 |  |  |  | 365 |  |  |  | 222 |
Sub-total |  |  | 5,697 |  |  |  | 5,228 |  |  |  | 5,545 |  |  |  | 6,778 |  |  |  | 1,175 |  |  |  | 1,002 |
Amounts Capitalized and Deferred |  |  | (2,590 | ) |  |  | (2,402 | ) |  |  | (2,557 | ) |  |  | (3,418 | ) |  |  | (339 | ) |  |  | (297 | )
Net Periodic Benefit Cost Recognized |  | $ | 3,107 |  |  | $ | 2,826 |  |  | $ | 2,988 |  |  | $ | 3,360 |  |  | $ | 836 |  |  | $ | 705 |

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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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 (k) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + 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 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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