Calculation Of Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2019

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 June 30,		Six Months Ended June 30,
	2019	2018	2019	2018
	(In thousands)
Weighted-average shares of common stock outstanding	118,965	113,936	119,359	105,639
Weighted-average potential shares of common stock outstanding:
Conversion spread related to Subordinated Convertible Debentures	—	8,776	—	17,178
Unvested RSUs and ESPP	396	488	478	582
Shares used to compute diluted earnings per share	119,361	123,200	119,837	123,399