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Retirement Plans (Schedule of Costs of Retirement Plans) (Details) - Pension Plan - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Defined Contribution Plan Disclosure |  |  |  |
Expenses associated with contributions made | $ 832 | $ 902 | $ 1,527 | $ 1,596
United States |  |  |  |
Defined Contribution Plan Disclosure |  |  |  |
Expenses associated with contributions made | 680 | 770 | 1,230 | 1,314
Canada |  |  |  |
Defined Contribution Plan Disclosure |  |  |  |
Expenses associated with contributions made | 34 | 34 | 72 | 68
United Kingdom |  |  |  |
Defined Contribution Plan Disclosure |  |  |  |
Expenses associated with contributions made | $ 118 | $ 98 | $ 225 | $ 214

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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