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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net Income $ 20,947 $ 14,066 $ 20,261
Other comprehensive income (loss), net of tax:      
Translation adjustment (Note M) 3,077 (704) 1,088
Deferred gains (losses) on cash flow hedges (Notes F & M):      
Fair value adjustment, net of tax of $182 in 2012 and $36 in 2010 (272)   57
Hedge de-designation, net of tax of $216 in 2010     342 [1]
Interest rate swap termination, net of tax of $95 in 2010     150
Total deferred gains (losses) on cash flow hedges (272)   549
Effect of retirement benefit obligations (Note M):      
Net loss arising from retirement benefit obligations, net of tax of $791 in 2012 (1,187)    
Less: amortization of loss included in net income, net of tax of $18 in 2012 27    
Total effects of retirement benefit obligations (1,160)    
Other comprehensive income (loss), net of tax 1,645 (704) 1,637
Comprehensive income $ 22,592 $ 13,362 $ 21,898
[1] Amount is recorded in interest expense on the consolidated statements of operations.