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Pension and Postretirement Benefits | 3 Months Ended
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Mar. 31, 2018
Compensation And Retirement Disclosure [Abstract] |
Pension and Postretirement Benefits | Note 17. Pension and Postretirement Benefits The components of net periodic benefit cost of our pension and postretirement benefit plans for the three months ended March 31, 2018 and 2017 consist of the following:
|  | Domestic Plans |  |  |  |  |  |  |  |  |
|  | Pension Plans |  |  | Postretirement Benefit Plans |  |  | Foreign Pension Plans |
(in thousands) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost |  | $ | 2 |  |  | $ | 9 |  |  | $ | 24 |  |  | $ | 30 |  |  | $ | 142 |  |  | $ | 130 |
Interest cost |  |  | 187 |  |  |  | 229 |  |  |  | 94 |  |  |  | 126 |  |  |  | 92 |  |  |  | 114 |
Expected return on plan assets |  |  | (35 | ) |  |  | (39 | ) |  |  | — |  |  |  | — |  |  |  | (129 | ) |  |  | (148 | )
Amortization of prior service credit |  |  | — |  |  |  | — |  |  |  | (84 | ) |  |  | (111 | ) |  |  | — |  |  |  | — |
Recognized net actuarial loss |  |  | 122 |  |  |  | 136 |  |  |  | 52 |  |  |  | 100 |  |  |  | 41 |  |  |  | 45 |
Net periodic benefit cost |  | $ | 276 |  |  | $ | 335 |  |  | $ | 86 |  |  | $ | 145 |  |  | $ | 146 |  |  | $ | 141 |
We expect to contribute $1.1 million to our funded pension plans, $1.0 million to our unfunded pension plans, and $1.1 million to our postretirement benefit plans in 2018. During the three months ended March 31, 2018, we contributed $0.2 million to our funded pension plans, $0.2 million to our unfunded pension plans, and $0.3 million to our postretirement benefit plans.

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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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