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Pension Plan | 3 Months Ended
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Mar. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Pension Plan | Pension Plan Park has a noncontributory defined benefit pension plan covering substantially all of its employees. The plan provides benefits based on an employee’s years of service and compensation. There were no pension plan contributions for the three-month periods ended March 31, 2016 and 2015. The following table shows the components of net periodic benefit income:
|  | Three Months Ended March 31,
(In thousands) |  | 2016 |  | 2015
Service cost |  | $ | 1,264 |  |  | $ | 1,342 |
Interest cost |  | 1,217 |  |  | 1,174 |
Expected return on plan assets |  | (2,737 | ) |  | (2,855 | )
Amortization of prior service cost |  | — |  |  | 4 |
Recognized net actuarial loss |  | 193 |  |  | 159 |
Net periodic benefit (income)/expense |  | $ | (63 | ) |  | $ | (176 | )

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