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Defined Benefit Pension Plans | 6 Months Ended
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Jun. 30, 2018
Defined Benefit Plan [Abstract] |
Defined Benefit Pension Plans | Defined Benefit Pension Plans We sponsor both funded and unfunded defined benefit pension plans offering death and disability, retirement, and special termination benefits for our international employees, primarily in Germany, France, Italy, Indonesia, Brazil, and Spain. The defined benefit obligation is calculated annually by using the projected unit credit method. The measurement date for the pension plans was December 31, 2017. Amounts recognized on the Consolidated Balance Sheets consist of:
| June 30, 2018 |  | December 31, 2017
| (in thousands)
Assets |  |  |
Plan assets in other long-term assets | $ | 938 |  |  | $ | 991 |
Liabilities |  |  |
Current portion of pension benefit obligation in wages and benefits payable | 3,123 |  |  | 3,260 |
Long-term portion of pension benefit obligation | 94,386 |  |  | 95,717 |
Pension benefit obligation, net | $ | 96,571 |  |  | $ | 97,986 |
Our asset investment strategy focuses on maintaining a portfolio using primarily insurance funds, which are accounted for as investments and measured at fair value, in order to achieve our long-term investment objectives on a risk adjusted basis. Our general funding policy for these qualified pension plans is to contribute amounts sufficient to satisfy regulatory funding standards of the respective countries for each plan. Net periodic pension benefit costs for our plans include the following components:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands)
Service cost | $ | 968 |  |  | $ | 924 |  |  | $ | 2,017 |  |  | $ | 1,852 |
Interest cost | 591 |  |  | 535 |  |  | 1,200 |  |  | 1,060 |
Expected return on plan assets | (169 | ) |  | (147 | ) |  | (350 | ) |  | (293 | )
Amortization of actuarial net loss | 392 |  |  | 403 |  |  | 795 |  |  | 794 |
Amortization of unrecognized prior service costs | 17 |  |  | 15 |  |  | 34 |  |  | 30 |
Net periodic benefit cost | $ | 1,799 |  |  | $ | 1,730 |  |  | $ | 3,696 |  |  | $ | 3,443 |
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 The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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