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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net loss $ (3,007) $ (44,415) $ (1,720)
Other comprehensive (loss) income, net of tax:      
Translation adjustment (2,062) (292) (5,906)
Less: Amount reclassified 235 0 0
Total translation loss (1,827) (292) (5,906)
Deferred gains (losses) on cash flow hedges:      
Fair value adjustment, net of tax of $(803), $347 and $38 (3,273) 1,212 161
Less: Settlement of cash flow hedges 984 (209) (14)
Total deferred (losses) gains on cash flow hedges (2,289) 1,003 147
Effect of retirement benefit obligations:      
Net (loss) income arising from retirement benefit obligations, net of tax of $(259), $(251) and $93 (680) (601) 373
Less: amortization of loss included in net loss, net of tax of $52, $34 and $23 79 51 95
Total effects of retirement benefit obligations (601) (550) 468
Other comprehensive (loss) income, net of tax (4,717) 161 (5,291)
Comprehensive loss $ (7,724) $ (44,254) $ (7,011)