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Pension Plan | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Pension Plan | Pension Plan 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 |
We do not expect to make any pension contributions during 2018.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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