Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2017		2016		2017		2016
	(In thousands, except per share amounts)
Amounts attributable to common stockholders:
Net income:
Net income — basic	$	56,164	$	47,727	$	299,347	$	110,792
After tax interest on convertible debt	13		13		38		35
Net income — diluted	$	56,177	$	47,740	$	299,385	$	110,827
Weighted average shares (denominator):
Weighted average shares — basic	187,435		193,274		187,761		193,999
Stock options	4,575		3,154		4,448		3,049
Restricted stock units	112		18		87		6
Convertible debt	121		121		121		121
Weighted average shares — diluted	192,243		196,567		192,417		197,175
Net income per share:
Basic	$	0.30	$	0.25	$	1.59	$	0.57
Diluted	$	0.29	$	0.24	$	1.56	$	0.56

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three Months Ended		Nine Months Ended
	September 30,		September 30,
	2017	2016	2017	2016
	(In thousands)
Antidilutive options	—	551	878	936
Antidilutive restricted stock units	—	—	—	2
Total common stock equivalents excluded from computation	—	551	878	938