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Pension Plan | 9 Months Ended
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Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract] |
Pension Plan | Pension Plan Net periodic pension cost consists of the following:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 113 |  |  | $ | 60 |  |  | $ | 339 |  |  | $ | 180 |
Interest cost on projected benefit obligation | 719 |  |  | 849 |  |  | 2,158 |  |  | 2,546 |
Expected return on plan assets | (1,297 | ) |  | (1,424 | ) |  | (3,892 | ) |  | (4,273 | )
Net amortization and deferral | 695 |  |  | 808 |  |  | 2,085 |  |  | 2,425 |
Net periodic pension cost | $ | 230 |  |  | $ | 293 |  |  | $ | 690 |  |  | $ | 878 |
We do not expect to make any pension contributions during 2016.

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