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Employee Benefit Plans (Notes) | 3 Months Ended
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Mar. 31, 2019
Retirement Benefits [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | Employee Benefit Plans We have funded and unfunded defined benefit plans covering certain employee groups in the U.S. and various European countries. Local statutory requirements govern many of our European plans. The defined benefit plans are mostly closed to new participants and, in some cases, existing participants no longer accrue benefits. As of both March 31, 2019 and December 31, 2018, the aggregate funded status of the defined benefit plans was a liability of $110 million, and is reported in Other noncurrent liabilities and Accrued payroll-related liabilities on our Unaudited Condensed Consolidated Balance Sheets. Net periodic benefit cost for our defined benefit plans included the following components for the three months ended March 31, 2019 and 2018 (in thousands):
| Three Months Ended
| March 31,
| 2019 |  | 2018
Service cost | $ | 587 |  |  | $ | 468 |
Interest cost | 985 |  |  | 670 |
Expected return on plan assets | (780 | ) |  | (717 | )
Amortization of actuarial (gain) loss | 253 |  |  | — |
Net periodic benefit cost | $ | 1,045 |  |  | $ | 421 |
For the three months ended March 31, 2019 and 2018, the service cost component of net periodic benefit cost was classified in Selling, general and administrative expenses, while the other components of net periodic benefit cost were classified in Other income, net in our Unaudited Condensed Consolidated Statements of Income.

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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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