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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract] |
Employee Benefit Plans | Employee Benefit Plans The components of net periodic benefit costs for the three and six months ended June 30, 2016 and 2015 were as follows (dollars in thousands):
|  | Pension Benefits |  | Other Benefits
|  | Three months ended June 30, |  | Three months ended June 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Service cost |  | $ | 2,652 |  |  | $ | 2,586 |  |  | $ | 1,015 |  |  | $ | 589 |
Interest cost |  | 1,076 |  |  | 1,283 |  |  | 643 |  |  | 491 |
Expected return on plan assets |  | (1,345 | ) |  | (1,331 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 75 |  |  | 80 |  |  | — |  |  | — |
Amortization of prior actuarial loss |  | 1,224 |  |  | 833 |  |  | 617 |  |  | 265 |
Net periodic benefit cost |  | $ | 3,682 |  |  | $ | 3,451 |  |  | $ | 2,275 |  |  | $ | 1,345 |
|  | Pension Benefits |  | Other Benefits
|  | Six months ended June 30, |  | Six months ended June 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Service cost |  | $ | 4,958 |  |  | $ | 4,616 |  |  | $ | 2,031 |  |  | $ | 1,178 |
Interest cost |  | 2,335 |  |  | 2,526 |  |  | 1,286 |  |  | 982 |
Expected return on plan assets |  | (2,569 | ) |  | (2,449 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 153 |  |  | 163 |  |  | — |  |  | — |
Amortization of prior actuarial loss |  | 2,081 |  |  | 1,272 |  |  | 1,233 |  |  | 530 |
Net periodic benefit cost |  | $ | 6,958 |  |  | $ | 6,128 |  |  | $ | 4,550 |  |  | $ | 2,690 |
The Company has made $4.0 million in pension contributions during the first six months of 2016 and expects to make total pension contributions of $8.0 million in 2016.

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