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Pension Plan | 6 Months Ended
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Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract] |
Pension Plan | Pension Plan Net periodic pension cost consists of the following:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 113 |  |  | $ | 52 |  |  | $ | 226 |  |  | $ | 120 |
Interest cost on projected benefit obligation | 719 |  |  | 810 |  |  | 1,438 |  |  | 1,697 |
Expected return on plan assets | (1,297 | ) |  | (1,380 | ) |  | (2,594 | ) |  | (2,849 | )
Net amortization and deferral | 695 |  |  | 805 |  |  | 1,390 |  |  | 1,617 |
Net periodic pension cost | $ | 230 |  |  | $ | 287 |  |  | $ | 460 |  |  | $ | 585 |
We do not expect to make any pension contributions during 2016.

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