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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2019

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, 2018			1,736,304						$	66.71					132,273						$	130.63
Granted			283,387						118.04						60,857						115.83
Options exercised/RSUs vested			(92,036)						21.26						(66,078)						106.42
Balance as of March 31, 2019			1,927,655						$	76.43					127,052						$	136.13

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, 2018			1,736,304						$	66.71					132,273						$	130.63
Granted			283,387						118.04						60,857						115.83
Options exercised/RSUs vested			(92,036)						21.26						(66,078)						106.42
Balance as of March 31, 2019			1,927,655						$	76.43					127,052						$	136.13

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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://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
-Section 50
-Paragraph 2
-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)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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