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Pension Benefits (Tables) | 9 Months Ended
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Sep. 30, 2019
Defined Benefit Plan [Abstract] |
Components of the net periodic benefit cost for the pension plans [Table Text Block] | Components of Net Periodic Benefit Cost for the Pension Plans
| For the Three Months Ended September 30, |  | For the Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
| (in thousands)
Components of net periodic benefit cost: |  |  |  |  |  |  |
Service cost | $ | 1,395 |  |  | $ | 1,683 |  |  | $ | 4,186 |  |  | $ | 5,048 |
Interest cost | 699 |  |  | 657 |  |  | 2,094 |  |  | 1,967 |
Expected return on plan assets that reduces periodic pension benefit cost | (393 | ) |  | (466 | ) |  | (1,180 | ) |  | (1,397 | )
Amortization of prior service cost | 4 |  |  | 4 |  |  | 13 |  |  | 13 |
Amortization of net actuarial loss | 239 |  |  | 331 |  |  | 718 |  |  | 995 |
Net periodic benefit cost | $ | 1,944 |  |  | $ | 2,209 |  |  | $ | 5,831 |  |  | $ | 6,626 |

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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://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=118255775&loc=d3e1928-114920 + Details
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