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Stockholders' Equity - Restricted and Performance Stock Activity (Details)	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Shares
Unvested, shares beginning of period (in shares)	578,394
Granted (in shares)	578,692
Vested (in shares)	(225,538)
Forfeited (in shares)	(327,238)
Unvested, shares end of period (in shares)	604,310
Weighted Average Grant Date Fair Value
Unvested, weighted average grant date fair value beginning balance (USD per share) | $ / shares	$ 58.35
Granted (USD per share) | $ / shares	75.38
Vested (USD per share) | $ / shares	59.08
Forfeited (USD per share) | $ / shares	63.69
Unvested, weighted average grant date fair value ending balance (USD per share) | $ / shares	$ 71.50
RSAs
Shares
Unvested, shares beginning of period (in shares)	401,804
Granted (in shares)	363,740
Vested (in shares)	(192,609)
Forfeited (in shares)	(173,140)
Unvested, shares end of period (in shares)	399,795
PSAs
Shares
Unvested, shares beginning of period (in shares)	84,762
Granted (in shares)	0
Vested (in shares)	(32,929)
Forfeited (in shares)	(48,701)
Unvested, shares end of period (in shares)	3,132
PSUs
Shares
Unvested, shares beginning of period (in shares)	91,828
Granted (in shares)	214,952
Vested (in shares)	0
Forfeited (in shares)	(105,397)
Unvested, shares end of period (in shares)	201,383

X

- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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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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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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

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- Definition

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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