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Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Foreign currency items      
Foreign currency items Beginning balance $ 790 $ 738  
Foreign currency items, Other comprehensive income (loss) before reclassifications 161 52  
Foreign currency items, Reclassification adjustments for losses (gains) reclassified into income, net of tax of nil 0 0  
Foreign currency items, Ending balance 951 790 738
Unrealized gains/(losses) on securities      
Unrealized gains/(losses) on securities, Beginning balance 27 616  
Unrealized gains/(losses) on securities, Other comprehensive income (loss) before reclassifications (12) 59  
Unrealized gains/(losses) on securities, Reclassification adjustments for losses (gains) reclassified into income 8 (648) (350)
Unrealized gains/(losses) on securities, Ending balance 23 27 616
Defined benefit pension plan      
Defined Benefit pension plan, Beginning balance (954) (1,188)  
Defined Benefit pension plan, Other comprehensive income (loss) before reclassifications (432) 234  
Defined Benefit pension plan, Reclassification adjustments for losses (gains) reclassified into income, net of tax of nil 0 0  
Defined Benefit pension plan, Ending balance (1,386) (954) (1,188)
Accumulated other comprehensive income (loss)      
Accumulated other comprehensive income, Beginning balance (137) 166  
Accumulated other comprehensive income, Other comprehensive income (loss) before reclassifications (283) 345  
Accumulated other comprehensive income, Reclassification adjustments for losses (gains) reclassified into income, net of tax of nil 8 (648)  
Accumulated other comprehensive income, Ending balance $ (412) $ (137) $ 166