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Goodwill and Other Intangibles (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Finite-lived intangible assets    
Gross Carrying Amount $ 22,127 $ 22,045
Accumulated Amortization (8,417) (8,007)
Indefinite-lived intangible assets    
Goodwill 15,570 15,537
Patents [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 4,819 4,819
Accumulated Amortization (4,209) (4,135)
Land use rights [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 1,299 1,322
Accumulated Amortization (128) (125)
Trademark [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 1,686 1,674
Accumulated Amortization (574) (529)
Customer backlog [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 578 578
Accumulated Amortization (578) (578)
Technology [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 2,959 2,924
Accumulated Amortization (420) (361)
Customer relationships [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 10,786 10,728
Accumulated Amortization $ (2,508) $ (2,279)