Calculation Of Net Income Per Share (Weighted-Average Shares Used In Calculation Of Basic And Diluted EPS) (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Weighted-average number of common shares outstanding	108,067	115,656	108,829	116,394
Conversion spread related to Convertible Debentures	21,872	16,973	21,472	16,392
Unvested RSUs, stock options, and ESPP	649	622	783	760
Shares used to compute diluted net income per share	130,588	133,251	131,084	133,546