Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016 USD ($) customer	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) customer	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) customer segment	Dec. 31, 2015 USD ($) customer	Dec. 31, 2014 USD ($) customer
Concentration Risk [Line Items]
Net revenues | $	$ 908,356	$ 841,251	$ 842,980	$ 825,678	$ 904,763	$ 813,270	$ 796,759	$ 760,802	$ 3,418,265	$ 3,275,594	$ 3,142,856
Number of reportable segments | segment									2
Percentage of international revenues accounting for the Company's net revenues									40.70%	43.10%	45.20%
US to International Revenues
Concentration Risk [Line Items]
Net revenues | $									$ 166,900	$ 180,200	$ 193,800
Net revenues | Customer concentration risk
Concentration Risk [Line Items]
Number of customers meeting concentration risk threshold	0				0				0	0
Ingram Micro | Net revenues | Customer concentration risk
Concentration Risk [Line Items]
Number of customers meeting concentration risk threshold											1
Concentration risk percentage											13.00%
Number of customer distribution agreements meeting concentration threshold											1