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International Retirement Plan (Schedule of Accumulated And Projected Benefit Obligations) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Retirement Benefits, Description [Abstract] |  |  |
Projected benefit obligation | $ 8,658 | $ 8,434 | $ 7,727
Accumulated benefit obligation | $ 7,587 | $ 7,570 |

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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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