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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Schedule of Stock Option Plan Activity

The following is a summary of our stock option and restricted stock activity and related information:

			Stock Options																		Restricted Stock Awards
			Shares						Weighted-Average Exercise Price						Shares						Weighted-Average Grant Date Fair Value
Balance as of December 31, 2017			1,876,332						$	53.17					133,294						$	91.60
Granted			224,312						161.83						62,033						169.91
Options exercised/RSUs vested			(318,653)						58.64						(60,135)						83.95
Forfeited			(12,228)						104.54						(1,165)						125.16
Balance as of September 30, 2018			1,769,763						$	65.60					134,027						$	130.99

Schedule of Restricted Stock Activity

The following is a summary of our stock option and restricted stock activity and related information:

			Stock Options																		Restricted Stock Awards
			Shares						Weighted-Average Exercise Price						Shares						Weighted-Average Grant Date Fair Value
Balance as of December 31, 2017			1,876,332						$	53.17					133,294						$	91.60
Granted			224,312						161.83						62,033						169.91
Options exercised/RSUs vested			(318,653)						58.64						(60,135)						83.95
Forfeited			(12,228)						104.54						(1,165)						125.16
Balance as of September 30, 2018			1,769,763						$	65.60					134,027						$	130.99

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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