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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2011
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure [Text Block]
Note 8.Property, Plant and Equipment

 

  December 31, 
  2010  2011 
  (in thousands) 
Land $10,154   10,154 
Building and improvements  17,199   17,737 
Machinery  21,195   27,213 
Research and development equipment  16,484   17,393 
Software  10,267   10,047 
Office furniture and equipment  6,463   7,281 
Others  10,029   9,881 
   91,791   99,706 
Accumulated depreciation and amortization  (45,582)  (53,594)
Prepayment for purchases of land and equipment  1,352   11,038 
  $47,561   57,150 

 

Depreciation and amortization of these assets for the years ended December 31, 2009, 2010 and 2011, was $11,602 thousand, $11,428 thousand and $10,615 thousand, respectively.