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Consolidated Statements of Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net income $ 2,154 $ 15,720 $ 12,278
Other comprehensive income (loss), net of tax:      
Translation adjustment (Note N) 7,823 (23,061) (5,281)
Less: Amount reclassified   378  
Total translation gain (loss) 7,823 (22,683) (5,281)
Deferred gains (losses) on cash flow hedges (Notes G & N):      
Fair value adjustment, net of tax of $0 in 2017, $11 in 2016 and $1 in 2015 17 17 (2)
Total deferred gains (losses) on cash flow hedges 17 17 (2)
Effect of retirement benefit obligations (Note N):      
Net (loss) income arising from retirement benefit obligations, net of tax of ($132) in 2017, ($135) in 2016 and $211 in 2015 (228) (202) 941
Less: amortization of loss included in net income, net of tax of $42 in 2017, $36 in 2016 and $53 in 2015 62 54 79
Total effects of retirement benefit obligations (166) (148) 1,020
Other comprehensive income (loss), net of tax 7,674 (22,814) (4,263)
Comprehensive income (loss) $ 9,828 $ (7,094) $ 8,015