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Defined Benefit Pension Plans Defined Benefit Pension Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plan [Abstract] |
Schedule of Changes in Benefit Obligation and Fair Value of Plan Assets [Table Text Block] | The following tables set forth the components of the changes in benefit obligations and fair value of plan assets:
| Year Ended December 31,
| 2017 |  | 2016
| (in thousands)
Change in benefit obligation: |  |  |
Benefit obligation at January 1, | $ | 97,261 |  |  | $ | 98,767 |
Service cost | 3,968 |  |  | 3,472 |
Interest cost | 2,264 |  |  | 2,573 |
Actuarial (gain) loss | (2,351 | ) |  | 7,733 |
Benefits paid | (3,136 | ) |  | (9,481 | )
Foreign currency exchange rate changes | 13,014 |  |  | (4,386 | )
Curtailment | (858 | ) |  | 14 |
Settlement | (175 | ) |  | (1,431 | )
Other | 833 |  |  | — |
Benefit obligation at December 31, | $ | 110,820 |  |  | $ | 97,261 |
Change in plan assets: |  |  |
Fair value of plan assets at January 1, | $ | 10,215 |  |  | $ | 9,662 |
Actual return on plan assets | 786 |  |  | 604 |
Company contributions | 399 |  |  | 348 |
Benefits paid | (383 | ) |  | (370 | )
Foreign currency exchange rate changes | 984 |  |  | (29 | )
Other | 833 |  |  | — |
Fair value of plan assets at December 31, | 12,834 |  |  | 10,215 |
Net pension benefit obligation at fair value | $ | 97,986 |  |  | $ | 87,046 |
Schedule of Amounts Recognized in the Consolidated Balance Sheets [Table Text Block] | Amounts recognized on the Consolidated Balance Sheets consist of:
| At December 31,
| 2017 |  | 2016
| (in thousands)
Assets |  |  |
Plan assets in other long-term assets | $ | 991 |  |  | $ | 654 |
Liabilities |  |  |
Current portion of pension benefit obligation in wages and benefits payable | 3,260 |  |  | 3,202 |
Long-term portion of pension benefit obligation | 95,717 |  |  | 84,498 |
Pension benefit obligation, net | $ | 97,986 |  |  | $ | 87,046 |
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] | Amounts in AOCI (pre-tax) that have not yet been recognized as components of net periodic benefit costs consist of:
| At December 31,
| 2017 |  | 2016
| (in thousands)
Net actuarial loss | $ | 25,379 |  |  | $ | 26,767 |
Net prior service cost | 641 |  |  | 619 |
Amount included in AOCI | $ | 26,020 |  |  | $ | 27,386 |
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | Amounts recognized in OCI (pre-tax) are as follows:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Net actuarial (gain) loss | $ | (3,209 | ) |  | $ | 6,316 |  |  | $ | (6,894 | )
Settlement (gain) loss | 2 |  |  | (1,343 | ) |  | (336 | )
Curtailment (gain) loss | 586 |  |  | — |  |  | — |
Plan asset (gain) loss | (192 | ) |  | (64 | ) |  | 343 |
Amortization of net actuarial loss | (2,308 | ) |  | (1,351 | ) |  | (1,979 | )
Amortization of prior service cost | (62 | ) |  | (58 | ) |  | (59 | )
Other | — |  |  | 4 |  |  | (46 | )
Other comprehensive (income) loss | $ | (5,183 | ) |  | $ | 3,504 |  |  | $ | (8,971 | )
Schedule of Net Periodic Pension Benefit Costs [Table Text Block] | Net periodic pension benefit costs for our plans include the following components:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (in thousands)
Service cost | $ | 3,968 |  |  | $ | 3,472 |  |  | $ | 4,572 |
Interest cost | 2,264 |  |  | 2,573 |  |  | 2,380 |
Expected return on plan assets | (594 | ) |  | (540 | ) |  | (502 | )
Amortization of prior service costs | 62 |  |  | 58 |  |  | 59 |
Amortization of actuarial net loss | 2,308 |  |  | 1,351 |  |  | 1,979 |
Settlement | (2 | ) |  | 1,343 |  |  | 375 |
Curtailment | (586 | ) |  | — |  |  | 46 |
Other | — |  |  | (3 | ) |  | (1 | )
Net periodic pension benefit costs | $ | 7,420 |  |  | $ | 8,254 |  |  | $ | 8,908 |
Schedule of Assumptions Used [Table Text Block] | The significant actuarial weighted average assumptions used in determining the benefit obligations and net periodic benefit cost for our benefit plans are as follows:
| At and For The Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Actuarial assumptions used to determine benefit obligations at end of period: |  |  |  |  |
Discount rate | 2.21 | % |  | 2.18 | % |  | 2.59 | %
Expected annual rate of compensation increase | 3.64 | % |  | 3.65 | % |  | 3.60 | %
Actuarial assumptions used to determine net periodic benefit cost for the period: |  |  |  |  |
Discount rate | 2.18 | % |  | 2.59 | % |  | 2.36 | %
Expected rate of return on plan assets | 5.58 | % |  | 5.29 | % |  | 5.45 | %
Expected annual rate of compensation increase | 3.65 | % |  | 3.60 | % |  | 3.37 | %
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] | The total obligations and fair value of plan assets for plans with projected benefit obligations and accumulated benefit obligations exceeding the fair value of plan assets are as follows:
| At December 31,
2017 |  | 2016
| (in thousands)
Projected benefit obligation | $ | 106,486 |  |  | $ | 94,110 |
Accumulated benefit obligation | 97,546 |  |  | 84,448 |
Fair value of plan assets | 7,509 |  |  | 6,410 |
Fair values of the assets held by the postretirement benefits plans by asset category [Table Text Block] | The fair values of our plan investments by asset category are as follows:
| Total |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Unobservable Inputs (Level 3)
| (in thousands)
| December 31, 2017
Cash | $ | 789 |  |  | $ | 789 |  |  | $ | — |
Insurance funds | 8,384 |  |  | — |  |  | 8,384 |
Other securities | 3,661 |  |  | — |  |  | 3,661 |
Total fair value of plan assets | $ | 12,834 |  |  | $ | 789 |  |  | $ | 12,045 |
| December 31, 2016
Cash | $ | 783 |  |  | $ | 783 |  |  | $ | — |
Insurance funds | 7,011 |  |  | — |  |  | 7,011 |
Other securities | 2,421 |  |  | — |  |  | 2,421 |
Total fair value of plan assets | $ | 10,215 |  |  | $ | 783 |  |  | $ | 9,432 |
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] | The following tables present a reconciliation of Level 3 assets held during the years ended December 31, 2017 and 2016.
| Balance at January 1, 2017 |  | Net Realized and Unrealized Gains |  | Net Purchases, Issuances, Settlements, and Other |  | Net Transfers Into Level 3 |  | Effect of Foreign Currency |  | Balance at December 31, 2017
| (in thousands)
Insurance funds | $ | 7,011 |  |  | $ | 257 |  |  | $ | 102 |  |  | $ | — |  |  | $ | 1,014 |  |  | $ | 8,384 |
Other securities | 2,421 |  |  | 523 |  |  | (93 | ) |  | 833 |  |  | (23 | ) |  | 3,661 |
Total | $ | 9,432 |  |  | $ | 780 |  |  | $ | 9 |  |  | $ | 833 |  |  | $ | 991 |  |  | $ | 12,045 |
| Balance at January 1, 2016 |  | Net Realized and Unrealized Gains |  | Net Purchases, Issuances, Settlements, and Other |  | Net Transfers Into Level 3 |  | Effect of Foreign Currency |  | Balance at December 31, 2016
| (in thousands)
Insurance funds | $ | 7,089 |  |  | $ | 235 |  |  | $ | 54 |  |  | $ | — |  |  | $ | (367 | ) |  | $ | 7,011 |
Other securities | 1,778 |  |  | 405 |  |  | (84 | ) |  | — |  |  | 322 |  |  | 2,421 |
Total | $ | 8,867 |  |  | $ | 640 |  |  | $ | (30 | ) |  | $ | — |  |  | $ | (45 | ) |  | $ | 9,432 |
Schedule of Expected Benefit Payments [Table Text Block] | Annual benefit payments for the next 10 years, including amounts to be paid from our assets for unfunded plans and reflecting expected future service, as appropriate, are expected to be paid as follows:
| Year Ending December 31, |  | Estimated Annual Benefit Payments
|  |  | (in thousands)
| 2018 |  | $ | 3,801 |
| 2019 |  | 3,124 |
| 2020 |  | 3,744 |
| 2021 |  | 4,329 |
| 2022 |  | 4,511 |
| 2023-2027 |  | 28,121 |

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- Definition Tabular disclosure of the change in the benefit obligation of pension plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure of accumulated benefit obligations and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated benefit obligation exceeds the fair value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 + Details
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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 net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + 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 (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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 (k) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period. + 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 (d)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -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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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + 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 (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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