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Employee benefit plans | 6 Months Ended
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Jun. 30, 2018
Employee benefit plans |
Employee benefit plans | 12. Employee benefit plans Defined Contribution Plans We have a defined contribution plan qualified under Section 401(k) of the Internal Revenue Code covering all U.S. employees. Employees may contribute a portion of their compensation, which is then matched by us, subject to certain limitations. Defined contribution expense for the three and six months ended June 30, 2018 was $2.8 million and $5.5 million, respectively. Defined contribution expense for the three and six months ended June 30, 2017 was $2.3 million and $4.5 million, respectively. Defined Benefit Pension Plans We have defined benefit pension plans for our employees in Europe which provide benefits to employees upon retirement, death or disability. The net periodic benefit cost was as follows (in thousands):
|  | Three Months Ended |  | Six Months Ended |
|  | June 30, |  | June 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
Service cost |  | $ | 1,032 |  | $ | 680 |  | $ | 2,111 |  | $ | 1,296 |
Interest cost |  |  | 68 |  |  | 52 |  |  | 139 |  |  | 98 |
Expected return on plan assets |  |  | (47) |  |  | (38) |  |  | (97) |  |  | (73) |
Amortization of prior service cost |  |  | 45 |  |  | 13 |  |  | 90 |  |  | 25 |
Amortization of actuarial losses |  |  | 66 |  |  | 34 |  |  | 132 |  |  | 68 |
Net periodic benefit cost |  | $ | 1,164 |  | $ | 741 |  | $ | 2,375 |  | $ | 1,414 |
The components of net periodic benefit cost other than the service cost component are included in other income (expense), net on the condensed consolidated statements of operations. We expect to contribute a total of $3.2 million to the plans in 2018 inclusive of the amounts contributed to the plan during the current period. As of June 30, 2018 and December 31, 2017, $13.7 million and $13.4 million, respectively, of accrued pension obligation is recorded in other long term liabilities on the condensed consolidated balance sheets.

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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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