Summary Of Significant Accounting Policies (Schedule Of Risk Concentration) (Details) (USD $) In Thousands, unless otherwise specified					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013 Customer Concentration Risk [Member]	Dec. 31, 2012 Customer Concentration Risk [Member]	Dec. 31, 2011 Customer Concentration Risk [Member]	Dec. 31, 2013 1st Largest Channel Partner [Member] Customer Concentration Risk [Member]	Dec. 31, 2012 1st Largest Channel Partner [Member] Customer Concentration Risk [Member]	Dec. 31, 2011 1st Largest Channel Partner [Member] Customer Concentration Risk [Member]	Dec. 31, 2013 2nd Largest Channel Partner [Member] Customer Concentration Risk [Member]	Dec. 31, 2012 2nd Largest Channel Partner [Member] Customer Concentration Risk [Member]	Dec. 31, 2011 2nd Largest Channel Partner [Member] Customer Concentration Risk [Member]	Dec. 31, 2013 UNITED STATES	Dec. 31, 2012 UNITED STATES	Dec. 31, 2013 Foreign [Member]	Dec. 31, 2012 Foreign [Member]
Concentration Risk [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 742,486	$ 576,703	$ 471,828	$ 472,479										$ 530,680	$ 399,295	$ 211,806	$ 177,408
Revenue from channel partners					25.00%	26.00%	26.00%	6.00%	6.00%	4.00%	2.00%	3.00%	3.00%
Direct sale customers exceeding 5% of revenue					0	0	0
Cash and cash equivalents held in excess of deposit insurance, foreign and domestic	717,589	559,023
Cash and cash equivalents held with one U.S. financial institution, foreign and domestic	$ 378,562	$ 296,270