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Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |
Fair value adjustment, tax | $ (347) | $ 38 | $ 0
Net (loss) income arising from retirement benefit obligations, tax | (251) | 93 | (132)
Amortization of loss included in net income, tax | $ 34 | $ 23 | $ 42

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- Definition Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e640-108580 + Details
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