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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Contribution Plan Disclosure |  |  |
Expenses associated with contributions made | $ 1,440 | $ 2,909 | $ 3,406
United States |  |  |
Defined Contribution Plan Disclosure |  |  |
Expenses associated with contributions made | 866 | 2,323 | 2,762
Canada |  |  |
Defined Contribution Plan Disclosure |  |  |
Expenses associated with contributions made | 137 | 144 | 193
United Kingdom |  |  |
Defined Contribution Plan Disclosure |  |  |
Expenses associated with contributions made | $ 437 | $ 442 | $ 451

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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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