Net Income Per Share (Reconciliation Of Denominator Of Net Income Per Share) (Details)	3 Months Ended				6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Jun. 30, 2011		Jun. 30, 2010
Net Income Per Share
Shares used in computing basic net income per share	88,320,000		89,434,000		90,301,000		89,548,000
Dilutive effect of stock options and restricted stock units	2,043,000	[1]	2,486,000	[1]	2,441,000	[1]	2,587,000	[1]
Shares used in computing diluted net income per share	90,363,000		91,920,000		92,742,000		92,135,000
Common stock outstanding excluded from computation of diluted EPS	4,800,000		5,800,000		2,800,000		5,500,000

[1] Options to purchase 4.8 million and 5.8 million shares of common stock were outstanding during the three months ended June 30, 2011 and 2010, respectively, and 2.8 million and 5.5 million shares of common stock during the six months ended June 30, 2011 and 2010, respectively, were outstanding but were not included in the computation of diluted net income per share as inclusion would have been anti-dilutive.