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Employee Benefits (Tables) | 6 Months Ended
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Jun. 30, 2018
Employee Benefits [Abstract] |
Components of Net Periodic Benefit Cost for Postretirement Benefit Plans | The components of net periodic benefit cost for our postretirement benefit plans for the three months and six months ended June 30, 2018 and 2017 were as follows (in thousands):
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
Postretirement benefits |  | 2018 |  |  | 2017 (1) |  |  | 2018 |  |  | 2017 (1) |
Service cost |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 1 |  |  |  | 2 |  |  |  | 3 |  |  |  | 4 |
Amortization of prior service cost |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Actuarial net gain |  |  | (12 | ) |  |  | (271 | ) |  |  | (21 | ) |  |  | (330 | )
Net periodic benefit cost (credit) |  | $ | (11 | ) |  | $ | (269 | ) |  | $ | (18 | ) |  | $ | (326 | )
| (1) | Net periodic benefit cost (credit) has been reclassified from selling, general and administrative expenses to other non-operating income (expense), net on our consolidated statement of operations upon adoption of ASU 2017-07, Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost, see Note 2, “Summary of Significant Accounting Policies” for additional information.

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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