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Segment, Product and Geographic Information (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Significant Customer [Line Items]    
Accounts receivable $ 92,530 $ 79,799
Customer A and its affiliates [Member]    
Segment Reporting Significant Customer [Line Items]    
Accounts receivable 55,681 40,488
Customer B and its affiliates [Member]    
Segment Reporting Significant Customer [Line Items]    
Accounts receivable $ 36,849 $ 39,311