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Segment, Product and Geographic Information (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue $ 685,167 $ 802,917 $ 691,789
Taiwan [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 176,951 199,985 254,763
China [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 421,208 507,470 372,538
Other Asia Pacific (Philippines, Korea and Japan) [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue 67,779 54,159 53,053
Europe And America [Member]      
Segment Reporting, Revenue Reconciling Item [Line Items]      
Total revenue $ 19,229 $ 41,303 $ 11,435