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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 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			311,884						$	117.63					98,404						$	114.15
Options exercised/RSUs vested			(104,249)						$	23.16					(69,529)						$	110.87
Balance as of June 30, 2019			1,943,939						$	77.17					161,148						$	129.10

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			311,884						$	117.63					98,404						$	114.15
Options exercised/RSUs vested			(104,249)						$	23.16					(69,529)						$	110.87
Balance as of June 30, 2019			1,943,939						$	77.17					161,148						$	129.10

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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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901

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