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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Employee Benefit Plans | Employee Benefit Plans The components of net periodic benefit costs, included in other operating expenses on the condensed consolidated statements of income, for the three months ended March 31, 2017 and 2016 were as follows (dollars in thousands):
|  | Pension Benefits |  | Other Benefits
|  | Three months ended March 31, |  | Three months ended March 31,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost |  | $ | 2,580 |  |  | $ | 2,306 |  |  | $ | 721 |  |  | $ | 1,016 |
Interest cost |  | 1,198 |  |  | 1,259 |  |  | 565 |  |  | 643 |
Expected return on plan assets |  | (1,285 | ) |  | (1,224 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 74 |  |  | 78 |  |  | (156 | ) |  | — |
Amortization of prior actuarial loss |  | 1,081 |  |  | 857 |  |  | 457 |  |  | 616 |
Settlements |  | 257 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost |  | $ | 3,905 |  |  | $ | 3,276 |  |  | $ | 1,587 |  |  | $ | 2,275 |
The Company has made no pension contributions during the first three months of 2017, and expects to make pension contributions between $5.0 million and $10.0 million in 2017.

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