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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]    
Land $ 14,328 $ 14,328
Building and improvements 22,821 22,460
Machinery 42,687 42,770
Research and development equipment 26,695 25,949
Software 12,902 13,260
Office furniture and equipment 11,210 10,655
Others 27,269 24,793
Property, Plant and Equipment, Gross 157,912 154,215
Accumulated depreciation and amortization (111,915) (101,373)
Prepayment for purchases of land and equipment 2,175 1,619
Property, Plant and Equipment, Net $ 48,172 $ 54,461