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Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Foreign currency items Beginning balance $ 738 $ 610  
Foreign currency items, Net current period change 52 128  
Foreign currency items, Reclassification adjustments:      
Foreign currency items, Reclassification adjustments for gains (losses) reclassified into income 0 0  
Foreign currency items, Ending balance 790 738 610
Unrealized gains/(losses) on securities, Beginning balance 616 1,236  
Unrealized gains/(losses) on securities, Net current period change 59 (283)  
Unrealized gains/(losses) on securities, Reclassification adjustments:      
Unrealized gains/(losses) on securities, Reclassification adjustments for gains (losses) reclassified into income (648) (350) (296)
Unrealized gains/(losses) on securities, Ending balance 27 616 1,236
Defined Benefit pension plan, Beginning balance (1,188) (642)  
Defined Benefit pension plan, Net current period change 234 (546)  
Defined Benefit pension plan, Reclassification adjustments:      
Defined Benefit pension plan, Reclassification adjustments for gains (losses) reclassified into income 0 0  
Defined Benefit pension plan, Ending balance (954) (1,188) (642)
Accumulated other comprehensive income, Beginning balance 166 1,204  
Accumulated other comprehensive income, Net current period change 345 (723)  
Accumulated other comprehensive income, Reclassification adjustments:      
Accumulated other comprehensive income, Reclassification adjustments for gains (losses) reclassified into income (648) (315)  
Accumulated other comprehensive income, Ending balance $ (137) $ 166 $ 1,204