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Stockholders' Equity - Share Activity (Details)	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Number of Shares
Beginning Balance (shares)	604,310
Granted (shares)	370,730
Vested (shares)	(147,488)
Forfeited (shares)	(58,396)
Ending Balance (shares)	769,156
Weighted Average Grant Date Fair Value
Begining Balance (usd per share) | $ / shares	$ 71.50
Granted (usd per share) | $ / shares	137.53
Vested (usd per share) | $ / shares	72.21
Forfeited (usd per share) | $ / shares	87.99
Ending Balance (usd per share) | $ / shares	$ 101.93
RSAs
Number of Shares
Beginning Balance (shares)	399,795
Granted (shares)	228,902
Vested (shares)	(133,828)
Forfeited (shares)	(46,780)
Ending Balance (shares)	448,089
PSAs
Number of Shares
Beginning Balance (shares)	3,132
Granted (shares)	0
Vested (shares)	(3,132)
Forfeited (shares)	0
Ending Balance (shares)	0
PSUs
Number of Shares
Beginning Balance (shares)	201,383
Granted (shares)	141,828
Vested (shares)	(10,528)
Forfeited (shares)	(11,616)
Ending Balance (shares)	321,067

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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