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Components of Net Periodic Benefit Cost (Tables) | 3 Months Ended
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Mar. 31, 2018
Retirement Benefits [Abstract] |
Schedule of Net Benefit Costs |
|  | Three Months Ended March 31,
|  | (000's)
|  | Pension Benefits |  | Post-Retirement Health Benefits
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost |  | $ | 347 |  |  | $ | 358 |  |  | $ | 10 |  |  | $ | 13 |
Interest cost |  | 798 |  |  | 905 |  |  | 33 |  |  | 43 |
Expected return on plan assets |  | (991 | ) |  | (985 | ) |  | — |  |  | — |
Net amortization of prior service cost |  | — |  |  | — |  |  | — |  |  | — |
Net amortization of net (gain) loss |  | 362 |  |  | 301 |  |  | — |  |  | — |
Net Periodic Benefit Cost |  | $ | 516 |  |  | $ | 579 |  |  | $ | 43 |  |  | $ | 56 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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