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Stock-Based Compensation - Performance Stock Unit Activity (Details) - Performance stock units - $ / shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Awards
Outstanding, beginning of period (in shares)	386,459
Granted (in shares)	486,213
Vested (in shares)	0
Forfeited (in shares)	0
Outstanding, end of period (in shares)	872,672
Weighted Average Grant Date Fair Value
Beginning of period (in dollars per share)	$ 21.94
Granted (in dollars per share)	6.68	$ 22.35
Vested (in dollars per share)	0
Forfeited (in dollar per share)	0
End of period (in dollars per share)	$ 13.44

X

- 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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
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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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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 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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Number of non-option equity instruments exercised by participants.

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Number of shares under non-option equity instrument agreements that were either cancelled or expired.

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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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