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Consolidated Statements of Comprehensive (Loss) Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net (loss) income $ (44,415) $ (1,720) $ 2,154
Other comprehensive income (loss) , net of tax:      
Translation adjustment (292) (5,906) 7,823
Deferred (losses) gains on cash flow hedges :      
Settlement of cash flow hedge (209) (14) 0
Fair value adjustment, net of tax of $347 in 2019, $38 in 2018 and $0 in 2017 1,212 161 17
Total deferred gains on cash flow hedges 1,003 147 17
Effect of retirement benefit obligations:      
Net (loss) income arising from retirement benefit obligations, net of tax of $(251) in 2019, $93 in 2018 and $(132) in 2017 (601) 373 (228)
Less: amortization of loss included in net (loss) income, net of tax of $34 in 2019, $23 in 2018 and $42 in 2017 51 95 62
Total effects of retirement benefit obligations (550) 468 (166)
Other comprehensive income (loss), net of tax 161 (5,291) 7,674
Comprehensive (loss) income $ (44,254) $ (7,011) $ 9,828