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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Land $ 14,328 $ 14,328
Building and improvements 24,944 22,821
Machinery 54,262 42,687
Research and development equipment 35,180 26,695
Software 10,484 12,902
Office furniture and equipment 11,694 11,210
Others 29,158 27,269
Property, Plant and Equipment, Gross 180,050 157,912
Accumulated depreciation and amortization (122,148) (111,915)
Prepayment for purchases of land, building and equipment 28,771 2,175
Property, Plant and Equipment, Net $ 86,673 $ 48,172