XML 47 R37.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Pension Benefits and Other Postretirement Benefit Plans (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2018
Defined Benefit Plan [Abstract] |
Components of net periodic benefit cost | The components of net periodic (benefit) cost for the periods indicated were:
| Pension Benefits |  | Retirement Health and Life Insurance Benefits
(Dollars in thousands) | Three Months Ended |  | Six Months Ended |  | Three Months Ended |  | Six Months Ended
June 30, |  | June 30, |  | June 30, |  | June 30,
Change in benefit obligation: | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 17 |  |  | $ | 17 |  |  | $ | 38 |  |  | $ | 56 |
Interest cost | 1,692 |  |  | 1,841 |  |  | 3,372 |  |  | 3,682 |  |  | 16 |  |  | 13 |  |  | 31 |  |  | 31 |
Expected return on plan assets | (2,164 | ) |  | (2,309 | ) |  | (4,333 | ) |  | (4,618 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service credit | — |  |  | — |  |  | — |  |  | — |  |  | (400 | ) |  | (407 | ) |  | (801 | ) |  | (780 | )
Amortization of net loss (gain) | 457 |  |  | 433 |  |  | 913 |  |  | 866 |  |  | — |  |  | (17 | ) |  | — |  |  | (31 | )
Net periodic (benefit) cost | $ | (15 | ) |  | $ | (35 | ) |  | $ | (48 | ) |  | $ | (70 | ) |  | $ | (367 | ) |  | $ | (394 | ) |  | $ | (732 | ) |  | $ | (724 | )

X
- References No definition available. + Details
Name: | us-gaap_DefinedBenefitPensionPlansAndDefinedBenefitPostretirementPlansDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration