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Retirement and Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Retirement and Benefit Plans [Table Text Block] | The following table presents the pension benefit costs:
| Three Months Ended June 30 |  | Six Months Ended June 30
| 2018 |  | 2017 |  | 2018 |  | 2017
| (thousands) |  |  |  |
Service cost | $ | 198 |  |  | $ | 301 |  |  | $ | 403 |  |  | $ | 602 |
Interest cost | 3,312 |  |  | 4,382 |  |  | 7,323 |  |  | 8,758 |
Expected return on plan assets | (3,292 | ) |  | (4,742 | ) |  | (7,880 | ) |  | (9,482 | )
Amortization of actuarial loss | 356 |  |  | 410 |  |  | 1,177 |  |  | 805 |
Plan settlement loss | 12,003 |  |  | — |  |  | 12,003 |  |  | — |
Net periodic benefit expense | $ | 12,577 |  |  | $ | 351 |  |  | $ | 13,026 |  |  | $ | 683 |

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- 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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