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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net Income $ 9,281 $ 20,947 $ 14,066
Other comprehensive income (loss), net of tax:      
Translation adjustment (Note M) (140) 3,077 (704)
Deferred gains (losses) on cash flow hedges (Notes F & M):      
Fair value adjustment, net of tax of $160 in 2013 and tax benefit of $182 in 2012 241 (272)  
Total deferred gains (losses) on cash flow hedges 241 (272)  
Effect of retirement benefit obligations (Note M):      
Net income (loss) arising from retirement benefit obligations, net of tax benefit of $241 in 2013 and tax of $791 in 2012 361 (1,187)  
Less: amortization of loss included in net income, net of tax of $36 in 2013 and $18 in 2012 54 27  
Total effects of retirement benefit obligations 415 (1,160)  
Other comprehensive income (loss), net of tax 516 1,645 (704)
Comprehensive income $ 9,797 $ 22,592 $ 13,362