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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Line Items]    
Land $ 14,328 $ 14,328
Building and improvements 22,460 18,582
Machinery 42,770 41,154
Research and development equipment 25,949 25,155
Software 13,260 12,537
Office furniture and equipment 10,655 9,968
Others 24,793 23,516
Property, Plant and Equipment, Gross 154,215 145,240
Accumulated depreciation and amortization (101,373) (89,090)
Prepayment for purchases of land and equipment 1,619 1,121
Property, Plant and Equipment, Net $ 54,461 $ 57,271