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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair value adjustment, tax $ 0 $ 11 $ 1
Net (loss) income arising from retirement benefit obligations, tax (132) (135) 211
Amortization of loss included in net income, tax $ 42 $ 36 $ 53