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Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2018
Pension Costs |
Defined Benefit Plan Disclosure [Line Items] |
Schedule Of Benefit Plans | The components of our consolidated net pension costs are set forth in the following table:
| For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (Dollars in thousands)
Service cost | $ | 498 |  |  | $ | 496 |  |  | $ | 1,494 |  |  | $ | 1,487 |
Interest cost | 1,239 |  |  | 1,385 |  |  | 3,721 |  |  | 4,154 |
Expected return on plan assets | (1,502 | ) |  | (1,389 | ) |  | (4,506 | ) |  | (4,166 | )
Net cost | $ | 235 |  |  | $ | 492 |  |  | $ | 709 |  |  | $ | 1,475 |
Postretirement Costs |
Defined Benefit Plan Disclosure [Line Items] |
Schedule Of Benefit Plans | The components of our consolidated net postretirement costs are set forth in the following table:
| For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (Dollars in thousands)
Service cost | $ | 3 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 1 |
Interest cost | 229 |  |  | 241 |  |  | 731 |  |  | 724 |
Net cost | $ | 232 |  |  | $ | 242 |  |  | $ | 734 |  |  | $ | 725 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: 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=82843861&loc=d3e1928-114920 + Details
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