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Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Unrealized gains/(losses) on securities      
Reclassification adjustments for losses (gains) reclassified into income, net of tax of nil $ (10) $ (223) $ 31
Accumulated other comprehensive income (loss)      
Beginning balance (1,879)    
Ending balance (2,467) (1,879)  
Parent Company [Member]      
Foreign currency items      
Beginning balance 208 781  
Other comprehensive income (loss) before reclassifications (479) (573)  
Reclassification adjustments for losses (gains) reclassified into income , net of tax of nil 0 0  
Ending balance (271) 208 781
Unrealized gains/(losses) on securities      
Beginning balance (238) 21  
Other comprehensive income (loss) before reclassifications (118) (63)  
Reclassification adjustments for losses (gains) reclassified into income, net of tax of nil 3 (196) 31
Ending balance (353) (238) 21
Defined benefit pension plan      
Beginning balance (1,849) (1,118)  
Other comprehensive income (loss) before reclassifications 6 (731)  
Reclassification adjustments for losses (gains) reclassified into income, net of tax of nil 0 0  
Ending balance (1,843) (1,849) (1,118)
Accumulated other comprehensive income (loss)      
Beginning balance (1,879) (316)  
Other comprehensive income (loss) before reclassifications (591) (1,367)  
Reclassification adjustments for losses (gains) reclassified into income, net of tax of nil 3 (196)  
Ending balance $ (2,467) $ (1,879) $ (316)