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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Schedule of stock option plan activity

The following is a summary of the Company’s 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, 2016	1,754,275			$	42.12			308,700			$	86.61
Granted	202,553			102.43				69,064			101.97
Options exercised/RSUs vested	(120,823	)		31.85				(102,810	)		81.74
Forfeited	(3,044	)		79.74				(966	)		89.01
Balance as of September 30, 2017	1,832,961			$	49.41			273,988			$	92.30

Schedule of restricted stock activity

The following is a summary of the Company’s 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, 2016	1,754,275			$	42.12			308,700			$	86.61
Granted	202,553			102.43				69,064			101.97
Options exercised/RSUs vested	(120,823	)		31.85				(102,810	)		81.74
Forfeited	(3,044	)		79.74				(966	)		89.01
Balance as of September 30, 2017	1,832,961			$	49.41			273,988			$	92.30

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- References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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