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Consolidated Statements of Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Net income (loss) $ 20,801 $ (3,007) $ (44,415)
Other comprehensive income (loss), net of tax:      
Translation adjustment 690 (2,062) (292)
Amount reclassified 3,404 235 0
Total translation gain (loss) 4,094 (1,827) (292)
Deferred gains (losses) on cash flow hedges:      
Fair value adjustment, net of tax of $(246), $803 and $(347) (311) (3,273) 1,212
Less: Settlement of cash flow hedges 1,514 984 (209)
Total deferred gains (losses) on cash flow hedges 1,203 (2,289) 1,003
Effect of retirement benefit obligations:      
Net income (loss) arising from retirement benefit obligations, net of tax of $(64), $259 and $251 191 (680) (601)
Less: amortization of loss included in net income (loss), net of tax of $(45), $(52) and $(34) 135 79 51
Total effects of retirement benefit obligations 326 (601) (550)
Other comprehensive income (loss), net of tax 5,623 (4,717) 161
Comprehensive income (loss) $ 26,424 $ (7,724) $ (44,254)