Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($) distributor customer	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) distributor	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) segment distributor customer	Dec. 31, 2018 USD ($) distributor		Dec. 31, 2017 USD ($) distributor
Concentration Risk [Line Items]
Number of reportable segments | segment									1
Percentage of international revenues accounting for the Company's net revenues									48.20%	47.00%		46.30%
Net revenues	$ 809,823	$ 732,901	$ 748,697	$ 719,143	$ 801,870	$ 732,476	$ 742,365	$ 697,192	$ 3,010,564	$ 2,973,903	[1],[2]	$ 2,824,686	[1],[2]
US to International Revenues
Concentration Risk [Line Items]
Net revenues									$ 161,200	$ 141,900		$ 151,900
Net revenues | Customer concentration risk
Concentration Risk [Line Items]
Number of distributors meeting concentration risk threshold | distributor	1								1			2
Ingram Micro | Net revenues | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk percentage												13.00%
Arrow Group | Net revenues | Customer concentration risk
Concentration Risk [Line Items]
Concentration risk percentage									15.00%	14.00%		12.00%
Strategic Service Provider
Concentration Risk [Line Items]
Net revenues									$ 119,929	$ 152,995		$ 174,881	[3]
Number of customers who meet benchmark threshold | customer	3								3

[1] As noted above, prior period amounts have not been adjusted under the modified retrospective method of adoption of the revenue recognition standard.

[2] Prior period amounts have not been adjusted under the modified retrospective method of adoption of the revenue recognition standard.

[3] As noted above, prior period amounts have not been adjusted under the modified retrospective method of adoption of the revenue recognition standard.