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Weighted Average Shares (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Calculation of Weighted Average Shares

Weighted-average shares were calculated as follows (in thousands):

	Year Ended December 31,
	2017			2016			2015
Basic weighted-average common shares outstanding	173,287			170,676			172,592
Effect of dilutive stock options	6,264			3,468			3,390
Diluted weighted-average common and common-equivalent shares outstanding	179,551			174,144			175,982

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- References

No definition available.

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- Definition

Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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