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Retirement Plans (Information About Plan Assets) (Details) - Pension Plan - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
United States |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | $ 12,468 | $ 14,892 | $ 14,180
United States | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 355 | 284 |
United States | Total fixed income |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 3,521 | 4,755 |
United States | Corporate bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 3,521 | 4,755 |
United States | Total mutual funds and equities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 8,592 | 9,853 |
United States | Mutual funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 1,881 | 712 |
United States | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 6,711 | 9,141 |
United Kingdom |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 6,347 | 6,904 | $ 5,826
United Kingdom | Cash and cash equivalents |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 685 | 695 |
United Kingdom | Bonds |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 2,866 | 2,276 |
United Kingdom | Other |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | 795 | 1,226 |
United Kingdom | Equity securities |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan asset | $ 2,001 | $ 2,707 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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