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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2015
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, 2015 and 2014 were as follows (dollars in thousands):
|  | Pension Benefits |  | Other Benefits
|  | Three months ended June 30, |  | Three months ended June 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost |  | $ | 2,586 |  |  | $ | 2,489 |  |  | $ | 589 |  |  | $ | 470 |
Interest cost |  | 1,283 |  |  | 1,487 |  |  | 491 |  |  | 339 |
Expected return on plan assets |  | (1,331 | ) |  | (1,302 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 80 |  |  | 216 |  |  | — |  |  | — |
Amortization of prior actuarial loss |  | 833 |  |  | 245 |  |  | 265 |  |  | 217 |
Net periodic benefit cost |  | $ | 3,451 |  |  | $ | 3,135 |  |  | $ | 1,345 |  |  | $ | 1,026 |
|  | Pension Benefits |  | Other Benefits
|  | Six months ended June 30, |  | Six months ended June 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost |  | $ | 4,616 |  |  | $ | 3,990 |  |  | $ | 1,178 |  |  | $ | 940 |
Interest cost |  | 2,526 |  |  | 2,295 |  |  | 982 |  |  | 677 |
Expected return on plan assets |  | (2,449 | ) |  | (2,235 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 163 |  |  | 218 |  |  | — |  |  | — |
Amortization of prior actuarial loss |  | 1,272 |  |  | 918 |  |  | 530 |  |  | 434 |
Net periodic benefit cost |  | $ | 6,128 |  |  | $ | 5,186 |  |  | $ | 2,690 |  |  | $ | 2,051 |
The Company has made $4.0 million in pension contributions during the first six months of 2015, and does not expect to make any additional pension contributions in 2015.

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