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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2017
Retirement Benefits [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 and six months ended June 30, 2017 and 2016 were as follows (dollars in thousands):
|  | Pension Benefits |  | Other Benefits
|  | Three months ended June 30, |  | Three months ended June 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost |  | $ | 2,819 |  |  | $ | 2,652 |  |  | $ | 721 |  |  | $ | 1,015 |
Interest cost |  | 1,431 |  |  | 1,076 |  |  | 565 |  |  | 643 |
Expected return on plan assets |  | (1,823 | ) |  | (1,345 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 95 |  |  | 75 |  |  | (155 | ) |  | — |
Amortization of prior actuarial loss |  | 1,082 |  |  | 1,224 |  |  | 457 |  |  | 617 |
Settlements |  | 256 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost |  | $ | 3,860 |  |  | $ | 3,682 |  |  | $ | 1,588 |  |  | $ | 2,275 |
|  | Pension Benefits |  | Other Benefits
|  | Six months ended June 30, |  | Six months ended June 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost |  | $ | 5,399 |  |  | $ | 4,958 |  |  | $ | 1,442 |  |  | $ | 2,031 |
Interest cost |  | 2,629 |  |  | 2,335 |  |  | 1,130 |  |  | 1,286 |
Expected return on plan assets |  | (3,108 | ) |  | (2,569 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 169 |  |  | 153 |  |  | (311 | ) |  | — |
Amortization of prior actuarial loss |  | 2,163 |  |  | 2,081 |  |  | 914 |  |  | 1,233 |
Settlements |  | 513 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost |  | $ | 7,765 |  |  | $ | 6,958 |  |  | $ | 3,175 |  |  | $ | 4,550 |
The Company has made $5.0 million in pension contributions during the first six months of 2017 and expects to make total pension contributions between $5.0 million and $10.0 million in 2017.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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