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Defined Benefit Pension Plans (Tables) | 6 Months Ended
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Jun. 30, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Schedule of Amounts Recognized in the Consolidated Balance Sheets [Table Text Block] | Amounts recognized on the Consolidated Balance Sheets consist of:
| June 30, 2017 |  | December 31, 2016
| (in thousands)
Assets |  |  |
Plan assets in other long-term assets | $ | 702 |  |  | $ | 654 |
Liabilities |  |  |
Current portion of pension benefit obligation in wages and benefits payable | 3,340 |  |  | 3,202 |
Long-term portion of pension benefit obligation | 93,263 |  |  | 84,498 |
Pension benefit obligation, net | $ | 95,901 |  |  | $ | 87,046 |
Schedule of Net Periodic Pension Benefit Costs [Table Text Block] | Net periodic pension benefit costs for our plans include the following components:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Service cost | $ | 924 |  |  | $ | 941 |  |  | $ | 1,852 |  |  | $ | 1,927 |
Interest cost | 535 |  |  | 650 |  |  | 1,060 |  |  | 1,283 |
Expected return on plan assets | (147 | ) |  | (133 | ) |  | (293 | ) |  | (259 | )
Settlements and other | — |  |  | (4 | ) |  | — |  |  | (7 | )
Amortization of actuarial net loss | 403 |  |  | 334 |  |  | 794 |  |  | 661 |
Amortization of unrecognized prior service costs | 15 |  |  | 16 |  |  | 30 |  |  | 31 |
Net periodic benefit cost | $ | 1,730 |  |  | $ | 1,804 |  |  | $ | 3,443 |  |  | $ | 3,636 |

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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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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=65897934&loc=d3e1928-114920 + Details
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