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Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
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