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Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Summary of Activities in Common Stock

The following table details activity in our common stock:

	Years Ended December 31,
	2018							2017							2016
	Shares			Amount				Shares			Amount				Shares			Amount
Stock option exercises	1,126			$	74,907			1,113			$	49,845			827			$	23,527
Purchases of common stock	(781	)		(150,050		)		(44	)		(6,613		)		(882	)		(112,699		)
Employee stock plan purchases	45			8,051				51			7,044				47			6,236

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- References

No definition available.

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- Definition

Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

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