Earnings Per Share Level 3 (Tables)

12 Months Ended

Dec. 31, 2017

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 for the three years ended December 31 is presented below:

	2017		2016		2015
	(In thousands, except per share amounts)
Amounts attributable to common stockholders:
Income from continuing operations — basic	$	546,663	$	177,038	$	234,162
After tax interest on convertible debt	52		43		50
Income from continuing operations — diluted	$	546,715	$	177,081	$	234,212
Loss from discontinued operations, net of tax	$	—	$	—	$	(390	)
Net income — basic	$	546,663	$	177,038	$	233,772
After tax interest on convertible debt	52		43		50
Net income — diluted	$	546,715	$	177,081	$	233,822
Weighted average shares:
Weighted average shares — basic	187,630		193,086		200,356
Stock options	4,396		2,823		3,973
Restricted share units	99		12		—
Convertible debt	121		121		121
Weighted average shares — diluted	192,246		196,042		204,450
Amounts attributable to common stockholders:
Income from continuing operations per share:
Basic	$	2.91	$	0.92	$	1.17
Diluted	$	2.84	$	0.90	$	1.14
Net income per share:
Basic	$	2.91	$	0.92	$	1.17
Diluted	$	2.84	$	0.90	$	1.14

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

	2017	2016	2015
	(In thousands)
Antidilutive options	911	982	3