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Pension Plan (Tables) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Schedule of net benefit cost | Net periodic pension cost consists of the following:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 169 |  |  | $ | 151 |  |  | $ | 338 |  |  | $ | 302 |
Interest cost on projected benefit obligation | 701 |  |  | 693 |  |  | 1,403 |  |  | 1,387 |
Expected return on plan assets | (1,354 | ) |  | (1,325 | ) |  | (2,709 | ) |  | (2,650 | )
Net amortization and deferral | 672 |  |  | 794 |  |  | 1,344 |  |  | 1,587 |
Net periodic pension cost | $ | 188 |  |  | $ | 313 |  |  | $ | 376 |  |  | $ | 626 |

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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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