XML 21 R9.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Benefit Plans | 3 Months Ended
--- | ---
Mar. 31, 2018
Retirement Benefits [Abstract] |
Benefit Plans | Retirement Plans and Postretirement Benefits The components of our consolidated net pension costs are set forth in the following table:
| For the Three Months Ended March 31,
| 2018 |  | 2017
| (Dollars in thousands)
Service cost | $ | 498 |  |  | $ | 496 |
Interest cost | 1,241 |  |  | 1,385 |
Expected return on plan assets | (1,502 | ) |  | (1,389 | )
Net cost | $ | 237 |  |  | $ | 492 |
The components of our consolidated net postretirement costs are set forth in the following table:
| For the Three Months Ended March 31,
| 2018 |  | 2017
| (Dollars in thousands)
Service cost | $ | — |  |  | $ | 1 |
Interest cost | 251 |  |  | 241 |
Net cost | $ | 251 |  |  | $ | 242 |

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

X
- 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
Name: | us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration