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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2018

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, 2017	1,876,332			$	53.17			133,294			$	91.60
Granted	202,994			159.02				45,203			158.29
Options exercised/RSUs vested	(133,800	)		64.73				(53,501	)		80.49
Balance as of March 31, 2018	1,945,526			$	63.43			124,996			$	120.48

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, 2017	1,876,332			$	53.17			133,294			$	91.60
Granted	202,994			159.02				45,203			158.29
Options exercised/RSUs vested	(133,800	)		64.73				(53,501	)		80.49
Balance as of March 31, 2018	1,945,526			$	63.43			124,996			$	120.48

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- References

No definition available.

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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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