Calculation Of Net Income Per Share (Tables)

3 Months Ended

Mar. 31, 2018

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:

	Three Months Ended March 31,
	2018	2017
	(In thousands)
Weighted-average shares of common stock outstanding	97,250	102,467
Weighted-average potential shares of common stock outstanding:
Conversion spread related to Subordinated Convertible Debentures	25,579	21,327
Unvested RSUs and ESPP	677	670
Shares used to compute diluted earnings per share	123,506	124,464