Earnings Per Share Level 3 (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]

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

A reconciliation of the numerators and denominators of basic and diluted EPS is presented below:

	Years Ended December 31,
	2018		2017		2016
	(In thousands, except per share amounts)
Amounts attributable to common stockholders:
Net income — basic	$	447,208	$	546,663	$	177,038
After tax interest on convertible debt	—		52		43
Net income — diluted	$	447,208	$	546,715	$	177,081
Weighted average shares:
Weighted average shares — basic	182,447		187,630		193,086
Stock options	4,339		4,396		2,823
Restricted share units	186		99		12
Convertible debt	—		121		121
Weighted average shares — diluted	186,972		192,246		196,042
Amounts attributable to common stockholders:
Net income per share:
Basic	$	2.45	$	2.91	$	0.92
Diluted	$	2.39	$	2.84	$	0.90

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

	Years Ended December 31,
	2018	2017	2016
	(In thousands)
Antidilutive options	1,035	911	982