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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 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	224,312			161.83				62,033			169.91
Options exercised/RSUs vested	(188,998	)		61.78				(57,497	)		82.79
Forfeited	(12,228	)		104.54				(1,165	)		125.16
Balance as of June 30, 2018	1,899,418			$	64.81			136,665			$	130.57

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	224,312			161.83				62,033			169.91
Options exercised/RSUs vested	(188,998	)		61.78				(57,497	)		82.79
Forfeited	(12,228	)		104.54				(1,165	)		125.16
Balance as of June 30, 2018	1,899,418			$	64.81			136,665			$	130.57

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

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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