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Defined Benefit Pension Plans (Tables) | 3 Months Ended
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Mar. 31, 2018
Defined Benefit Plan [Abstract] |
Schedule of Amounts Recognized in the Consolidated Balance Sheets [Table Text Block] | Amounts recognized on the Consolidated Balance Sheets consist of:
| March 31, 2018 |  | December 31, 2017
| (in thousands)
Assets |  |  |
Plan assets in other long-term assets | $ | 1,054 |  |  | $ | 991 |
Liabilities |  |  |
Current portion of pension benefit obligation in wages and benefits payable | 3,291 |  |  | 3,260 |
Long-term portion of pension benefit obligation | 100,045 |  |  | 95,717 |
Pension benefit obligation, net | $ | 102,282 |  |  | $ | 97,986 |
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 March 31,
| 2018 |  | 2017
| (in thousands)
Service cost | $ | 1,049 |  |  | $ | 928 |
Interest cost | 609 |  |  | 525 |
Expected return on plan assets | (181 | ) |  | (146 | )
Amortization of actuarial net loss | 403 |  |  | 391 |
Amortization of unrecognized prior service costs | 17 |  |  | 15 |
Net periodic benefit cost | $ | 1,897 |  |  | $ | 1,713 |
The components of net periodic benefit cost, other than the service cost component, are included in total other income (expense) on the Consolidated Statements of Operations.

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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=82843861&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=82843861&loc=d3e1928-114920 + Details
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