Calculation Of Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares [Table Text Block]

The following table presents the computation of weighted-average shares used in the calculation of basic and diluted net income per share:

	Year Ended December 31,
	2014	2013	2012
	(In thousands)
Weighted-average shares of common stock outstanding	126,710	144,591	156,953
Weighted-average potential shares of common stock outstanding:
Conversion spread related to Subordinated Convertible Debentures	13,384	10,361	5,944
Unvested RSUs	740	709	763
Stock Options	27	92	174
Employee stock purchase plan	34	33	75
Shares used to compute diluted net income per share	140,895	155,786	163,909