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Goodwill and Other Intangibles (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Finite-lived intangible assets    
Gross Carrying Amount $ 21,533 $ 17,781
Accumulated Amortization (7,224) (6,429)
Indefinite-lived intangible assets    
Goodwill 15,116 12,199
Patents [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 4,819 4,819
Accumulated Amortization (3,986) (3,836)
Land use rights [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 1,257 1,259
Accumulated Amortization (109) (97)
Trade Mark [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 1,622 965
Accumulated Amortization (432) (364)
Customer backlog [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 547 504
Accumulated Amortization (546) (504)
Technology [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 2,822 1,784
Accumulated Amortization (237) (77)
Customer relationships [Member]
   
Finite-lived intangible assets    
Gross Carrying Amount 10,466 8,450
Accumulated Amortization $ (1,914) $ (1,551)