Calculation Of Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2015

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:

	Three Months Ended June 30,		Six Months Ended June 30,
	2015	2014	2015	2014
	(In thousands)
Weighted-average shares of common stock outstanding	115,656	129,350	116,394	131,372
Weighted-average potential shares of common stock outstanding:
Conversion spread related to the Subordinated Convertible Debentures	16,973	11,291	16,392	12,788
Unvested RSUs	580	462	725	640
Employee stock purchase plan and stock options	42	39	35	61
Shares used to compute diluted net income per share	133,251	141,142	133,546	144,861