Pension and Other Postretirement Benefit Plans (Tables)
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12 Months Ended |
Dec. 31, 2017 |
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| Pension and Other Postretirement Benefit Plans [Abstract] |
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| Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
Amounts recognized for the Dutch Plan in the Consolidated Balance Sheets for the years ended December 31, 2017 and 2016 consist of (in thousands): | | | | | | | | | | 2017 | | 2016 | Deferred tax asset | $ | 2,564 |
| | $ | 2,328 |
| Other long-term liabilities | 10,253 |
| | 9,948 |
| Accumulated other comprehensive loss | (8,162 | ) | | (9,169 | ) |
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| Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] |
The following table summarizes the change in the projected benefit obligation and the fair value of plan assets for the Dutch Plan for the years ended December 31, 2017 and 2016 (in thousands): | | | | | | | | | | 2017 | | 2016 | Projected Benefit Obligation: | | | |
| Projected benefit obligation at beginning of year | $ | 56,082 |
| | $ | 50,759 |
| Service cost | 1,494 |
| | 1,456 |
| Interest cost | 1,121 |
| | 1,329 |
| Benefits paid | (1,212 | ) | | (1,139 | ) | Administrative expenses | (35 | ) | | (31 | ) | Actuarial (gain) loss, net | (1,005 | ) | | 5,225 |
| Unrealized (gain) loss on foreign exchange | 6,953 |
| | (1,517 | ) | Projected benefit obligation at end of year | $ | 63,398 |
| | $ | 56,082 |
| | | | | Fair Value of Plan Assets: | | | | Fair value of plan assets at beginning of year | $ | 46,134 |
| | $ | 41,116 |
| Increase in plan asset value | 919 |
| | 6,328 |
| Employer contributions | 1,595 |
| | 1,118 |
| Benefits paid | (1,212 | ) | | (1,139 | ) | Administrative expenses | (35 | ) | | (31 | ) | Unrealized gain (loss) on foreign exchange | 5,744 |
| | (1,258 | ) | Fair value of plan assets at end of year | $ | 53,145 |
| | $ | 46,134 |
| | | | | Under-funded status of the plan at end of the year | $ | (10,253 | ) | | $ | (9,948 | ) | | | | | Accumulated Benefit Obligation | $ | 56,035 |
| | $ | 47,980 |
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| Schedule of Net Benefit Costs [Table Text Block] |
The components of net periodic pension cost for the Dutch Plan under this plan for the years ended December 31, 2017, 2016, and 2015 included (in thousands): | | | | | | | | | | | | | | 2017 | | 2016 | | 2015 | Service cost | $ | 1,494 |
| | $ | 1,456 |
| | $ | 1,787 |
| Interest cost | 1,121 |
| | 1,329 |
| | 1,192 |
| Expected return on plan assets | (950 | ) | | (1,117 | ) | | (986 | ) | Unrecognized pension asset, net | — |
| | — |
| | (96 | ) | Prior service cost | (77 | ) | | (81 | ) | | (85 | ) | Unrecognized net actuarial loss | 440 |
| | 593 |
| | 727 |
| Net periodic pension cost | $ | 2,028 |
| | $ | 2,180 |
| | $ | 2,539 |
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| Schedule of Assumptions Used [Table Text Block] |
The following actuarial assumptions were used to determine the actuarial present value of our projected benefit obligation and the net periodic pension costs for the Dutch Plan at December 31, 2017 and 2016:
| | | | | | 2017 | | 2016 | Weighted average assumed discount rate | 2.00% | | 1.90% | Expected long-term rate of return on plan assets | 2.00% | | 1.90% | Weighted average rate of compensation increase | 2.90% | | 2.75% |
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| Schedule of Expected Benefit Payments [Table Text Block] |
Expected benefit payments to eligible participants under this plan for the next five years are as follows (in thousands): | | | | | 2018 | $ | 1,362 |
| 2019 | $ | 1,419 |
| 2020 | $ | 1,507 |
| 2021 | $ | 1,572 |
| 2022 | $ | 1,691 |
| Succeeding five years | $ | 9,808 |
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