Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block]

The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information):

	Three months ended September 30,				Nine months ended September 30,
	2017		2016		2017		2016
Earnings:
Net income (numerator for basic and diluted calculations)	$	227,591	$	198,719	$	605,293	$	511,294
Shares:
Weighted average outstanding shares (denominator for basic calculation)	64,488		64,146		64,430		64,281
Equivalent shares from outstanding stock options	1,165		669		1,174		663
Denominator for diluted calculation	65,653		64,815		65,604		64,944
Earnings per share:
Basic	$	3.53	$	3.10	$	9.39	$	7.95
Diluted	$	3.47	$	3.07	$	9.23	$	7.87