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Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table 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,
		2018				2017				2018				2017
Earnings:
Net income (numerator for basic and diluted calculations)		$	301,199			$	227,591			$	605,803			$	605,293
Shares:
Weighted average outstanding shares (denominator for basic calculation)		63,279				64,488				63,941				64,430
Equivalent shares from outstanding stock options		1,017				1,165				1,189				1,174
Denominator for diluted calculation		64,296				65,653				65,130				65,604
Earnings per share:
Basic		$	4.76			$	3.53			$	9.47			$	9.39
Diluted		$	4.68			$	3.47			$	9.30			$	9.23

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

The following table presents approximate amounts of stock options and performance contingent shares excluded from the calculation of common equivalent shares (in thousands):

		Three months ended September 30,						Nine months ended September 30,
		2018			2017			2018			2017
Excluded from common equivalent shares:
Stock options		227			87			349			296
Performance contingent shares		276			307			256			293

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- References

No definition available.

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- Definition

Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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X

- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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