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Defined Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Schedule of Costs of Retirement Plans | The components of net periodic pension and postretirement benefit costs for the three and six months ended June 30, 2016 and 2015 are as follows (dollars in thousands):
|  | Pension Plans |  | Other Postretirement Benefits
|  | Three months ended June 30, |  | Six months ended June 30, |  | Three months ended June 30, |  | Six months ended June 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015
Service costs |  | $ | 240 |  |  | $ | 230 |  |  | $ | 490 |  |  | $ | 470 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest costs |  | 390 |  |  | 410 |  |  | 790 |  |  | 830 |  |  | 10 |  |  | — |  |  | 10 |  |  | 10 |
Expected return on plan assets |  | (420 | ) |  | (490 | ) |  | (840 | ) |  | (1,010 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost |  | 10 |  |  | 10 |  |  | 10 |  |  | 10 |  |  | — |  |  | — |  |  | — |  |  | — |
Settlement/curtailment loss |  | — |  |  | 2,750 |  |  | — |  |  | 2,750 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of net (gain)/loss |  | 240 |  |  | 360 |  |  | 470 |  |  | 740 |  |  | (20 | ) |  | (10 | ) |  | (30 | ) |  | (20 | )
Net periodic benefit cost |  | $ | 460 |  |  | $ | 3,270 |  |  | $ | 920 |  |  | $ | 3,790 |  |  | $ | (10 | ) |  | $ | (10 | ) |  | $ | (20 | ) |  | $ | (10 | )

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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