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Net Sales by Product Group and End Market - Net Sales by Product Group (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Net sales by product group $ 894,964 $ 1,025,319
Advanced products    
Disaggregation of Revenue [Line Items]    
Net sales by product group 422,446 475,752
Mainstream products    
Disaggregation of Revenue [Line Items]    
Net sales by product group $ 472,518 $ 549,567