Calculation Of Net Income Per Share (Weighted-Average Shares Used In Calculation Of Basic And Diluted EPS) (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Weighted-average number of common shares outstanding	144,591	156,953	165,408
Stock options	92	174	309
Unvested restricted stock units	709	763	736
Conversion spread related to Convertible Debentures	10,361	5,944	416
Employee stock purchase plan	33	75	18
Shares used to compute diluted net income per share	155,786	163,909	166,887