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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Employee Benefit Plans | Employee Benefit Plans The components of net periodic benefit costs for the three and nine months ended September 30, 2015 and 2014 were as follows (dollars in thousands):
|  | Pension Benefits |  | Other Benefits
|  | Three months ended September 30, |  | Three months ended September 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost |  | $ | 2,307 |  |  | $ | 2,195 |  |  | $ | 1,868 |  |  | $ | 826 |
Interest cost |  | 1,262 |  |  | 1,367 |  |  | 947 |  |  | 794 |
Expected return on plan assets |  | (1,224 | ) |  | (1,118 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 82 |  |  | 214 |  |  | — |  |  | — |
Amortization of prior actuarial loss |  | 636 |  |  | 489 |  |  | 1,319 |  |  | 361 |
Net periodic benefit cost |  | $ | 3,063 |  |  | $ | 3,147 |  |  | $ | 4,134 |  |  | $ | 1,981 |
|  | Pension Benefits |  | Other Benefits
|  | Nine months ended September 30, |  | Nine months ended September 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost |  | $ | 6,923 |  |  | $ | 6,185 |  |  | $ | 3,046 |  |  | $ | 1,766 |
Interest cost |  | 3,788 |  |  | 3,662 |  |  | 1,929 |  |  | 1,471 |
Expected return on plan assets |  | (3,673 | ) |  | (3,353 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 245 |  |  | 432 |  |  | — |  |  | — |
Amortization of prior actuarial loss |  | 1,908 |  |  | 1,407 |  |  | 1,849 |  |  | 795 |
Net periodic benefit cost |  | $ | 9,191 |  |  | $ | 8,333 |  |  | $ | 6,824 |  |  | $ | 4,032 |
The Company has made $4.0 million in pension contributions during the first nine months of 2015, and does not expect to make any additional pension contributions in 2015.

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