Note 2 - Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

The calculation of basic and diluted net income per share was as follows:

	Three Months Ended June 30,					Six Months Ended June 30,
(In thousands, except per-share amounts)	2018		2017			2018		2017
Net income (loss)—basic	$	208,949	$	(27,342	)	$	323,435	$	49,130
Adjustment for dilutive Convertible Senior Notes due 2019, net of tax (1)	—		—			—		(215		)
Net income (loss)—diluted	$	208,949	$	(27,342	)	$	323,435	$	48,915
Average common shares outstanding—basic	213,976		215,152			215,049		215,054
Dilutive effect of Convertible Senior Notes due 2017	—		—			—		602
Dilutive effect of Convertible Senior Notes due 2019	—		—			—		922
Dilutive effect of share-based compensation arrangements (2)	3,854		—			3,692		3,896
Adjusted average common shares outstanding—diluted	217,830		215,152			218,741		220,474
Net income (loss) per share:
Basic	$	0.98	$	(0.13	)	$	1.50	$	0.23
Diluted	$	0.96	$	(0.13	)	$	1.48	$	0.22

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(1) As applicable, includes coupon interest, amortization of discount and fees, and other changes in income that would result from the assumed conversion. Included in the six months ended June 30, 2017 is a benefit related to our adjustment of estimated accrued expense to actual amounts, resulting from the January 2017 settlement of our obligations on the remaining Convertible Senior Notes due 2019.

(2) There were no dilutive shares for the three months ended June 30, 2017, as a result of our net loss for the period. The following number of shares of our common stock equivalents issued under our share-based compensation arrangements and convertible debt, if any, were not included in the calculation of diluted net income (loss) per share because they were anti-dilutive:

	Three Months Ended June 30,		Six Months Ended June 30,
(In thousands)	2018	2017	2018	2017
Shares of common stock equivalents	484	5,975	351	442
Shares of Convertible Senior Notes due 2017	—	509	—	—