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Property, Plant and Equipment (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]    
Land $ 14,328 $ 14,328
Building and improvements 18,109 17,740
Machinery 39,530 31,494
Research and development equipment 23,030 18,020
Software 12,080 10,540
Office furniture and equipment 9,125 7,681
Others 19,362 17,282
Property, Plant and Equipment, Gross 135,564 117,085
Accumulated depreciation and amortization (76,997) (66,420)
Prepayment for purchases of equipment 2,021 1,944
Property, Plant and Equipment, Net $ 60,588 $ 52,609