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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2016

Equity [Abstract]

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 Award
	Shares			Weighted- Average Exercise Price				Shares			Weighted- Average Grant Date Fair Value
Balance as of December 31, 2015	1,683,341			$	34.23			130,749			$	60.36
Granted	263,489			92.09				234,855			95.31
Exercised	(130,185	)		34.65				(53,121	)		93.49
Forfeited	(30,115	)		60.17				(2,183	)		71.03
Balance as of September 30, 2016	1,786,530			$	42.29			310,300			$	76.02

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 Award
	Shares			Weighted- Average Exercise Price				Shares			Weighted- Average Grant Date Fair Value
Balance as of December 31, 2015	1,683,341			$	34.23			130,749			$	60.36
Granted	263,489			92.09				234,855			95.31
Exercised	(130,185	)		34.65				(53,121	)		93.49
Forfeited	(30,115	)		60.17				(2,183	)		71.03
Balance as of September 30, 2016	1,786,530			$	42.29			310,300			$	76.02

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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=6415400&loc=d3e5070-113901

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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