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Retirement Plans (Schedule of Costs of Retirement Plans) (Details) - Pension Plan - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Defined Contribution Plan Disclosure |  |
Expenses associated with contributions made | $ 3,406 | $ 3,314
United States |  |
Defined Contribution Plan Disclosure |  |
Expenses associated with contributions made | 2,762 | 2,641
Canada |  |
Defined Contribution Plan Disclosure |  |
Expenses associated with contributions made | 193 | 223
United Kingdom |  |
Defined Contribution Plan Disclosure |  |
Expenses associated with contributions made | $ 451 | $ 450

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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