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Segment Information (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
distributor
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
distributor
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
segment
distributor
Dec. 31, 2016
USD ($)
distributor
Dec. 31, 2015
USD ($)
distributor
Concentration Risk [Line Items]                      
Number of reportable segments | segment                 1    
Percentage of international revenues accounting for the Company's net revenues                 46.30% 46.30% 48.70%
Net revenues $ 777,857 $ 690,925 $ 693,227 $ 662,677 $ 734,584 $ 668,736 $ 673,987 $ 658,773 $ 2,824,686 $ 2,736,080 $ 2,646,154
US to International Revenues                      
Concentration Risk [Line Items]                      
Net revenues                 $ 151,900 $ 160,500 $ 178,700
Net revenues | Customer concentration risk                      
Concentration Risk [Line Items]                      
Number of distributors meeting concentration risk threshold | distributor 2       2       2 2 2
Ingram Micro | Net revenues | Customer concentration risk                      
Concentration Risk [Line Items]                      
Concentration risk percentage                 13.00% 13.00% 13.00%
Arrow Group | Net revenues | Customer concentration risk                      
Concentration Risk [Line Items]                      
Concentration risk percentage                 12.00% 12.00% 11.00%