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Goodwill and Other Intangibles (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Finite-lived intangible assets    
Gross Carrying Amount $ 21,921 $ 17,781
Accumulated Amortization (7,656) (6,429)
Indefinite-lived intangible assets    
Goodwill 15,441 12,199
Patents [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 4,819 4,819
Accumulated Amortization (4,060) (3,836)
Land use rights [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 1,295 1,259
Accumulated Amortization (117) (97)
Trade Mark [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 1,662 965
Accumulated Amortization (476) (364)
Customer backlog [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 571 504
Accumulated Amortization (571) (504)
Technology [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 2,896 1,784
Accumulated Amortization (303) (77)
Customer relationships [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 10,678 8,450
Accumulated Amortization $ (2,129) $ (1,551)