Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($) distributor	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) distributor	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment distributor	Dec. 31, 2017 USD ($) distributor		Dec. 31, 2016 USD ($) distributor
Concentration Risk [Line Items]
Number of reportable segments | segment									1
Percentage of international revenues accounting for the Company's net revenues									47.00%	46.30%		46.30%
Net revenues	$ 801,870	$ 732,476	$ 742,365	$ 697,192	$ 777,857	$ 690,925	$ 693,227	$ 662,677	$ 2,973,903	$ 2,824,686	[1],[2]	$ 2,736,080	[1],[2]
US to International Revenues
Concentration Risk [Line Items]
Net revenues									$ 141,900	$ 151,900		$ 160,500
Net revenues | Customer concentration risk
Concentration Risk [Line Items]
Number of distributors meeting concentration risk threshold | distributor	1				2				1	2		2
Ingram Micro | Net revenues | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk percentage										13.00%		13.00%
Arrow Group | Net revenues | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk percentage									14.00%	12.00%		12.00%

[1] As noted above, prior period amounts have not been adjusted under the modified retrospective method of adoption of therevenue recognition standard. See Note 2 for further information regarding the Company’s adoption of the revenuerecognition standard.

[2] Prior period amounts have not been adjusted under the modified retrospective method of adoption of the revenue recognition standard. See Note 2 for further information regarding the Company’s adoption of the revenue recognition standard.