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Goodwill and Other Intangibles (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Finite-lived intangible assets      
Gross Carrying Amount $ 22,045 $ 17,781  
Accumulated Amortization (8,007) (6,429)  
Indefinite-lived intangible assets      
Goodwill 15,537 12,199 12,346
Patents [Member]
     
Finite-lived intangible assets      
Gross Carrying Amount 4,819 4,819  
Accumulated Amortization (4,135) (3,836)  
Land use rights [Member]
     
Finite-lived intangible assets      
Gross Carrying Amount 1,322 1,259  
Accumulated Amortization (125) (97)  
Trademark [Member]
     
Finite-lived intangible assets      
Gross Carrying Amount 1,674 965  
Accumulated Amortization (529) (364)  
Customer backlog [Member]
     
Finite-lived intangible assets      
Gross Carrying Amount 578 504  
Accumulated Amortization (578) (504)  
Technology [Member]
     
Finite-lived intangible assets      
Gross Carrying Amount 2,924 1,784  
Accumulated Amortization (361) (77)  
Customer relationships [Member]
     
Finite-lived intangible assets      
Gross Carrying Amount 10,728 8,450  
Accumulated Amortization $ (2,279) $ (1,551)