Calculation Of Net Income Per Share (Tables)

12 Months Ended

Dec. 31, 2016

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 earnings per share:

	Year Ended December 31,
	2016	2015	2014
	(In thousands)
Weighted-average shares of common stock outstanding	107,001	114,155	126,710
Weighted-average potential shares of common stock outstanding:
Conversion spread related to Subordinated Convertible Debentures	21,074	18,047	13,384
Unvested RSUs, stock options, and ESPP	758	829	801
Shares used to compute diluted earnings per share	128,833	133,031	140,895